This year in ESS, we will focus on global 21st century issues that threaten our beautiful planet. It will be the responsibility of this and future generations to find solutions to these problems through raising awareness, discovering new technology, rewarding innovation, and by passing legislation. This blog will reflect the voice of every earth and space science student in Ms. B's classes during the 2013-2014 school year.
Monday, December 2, 2013
Driving Question #3
When did the Achaean Eon occur?
How did the fluid part of Earth, the atmosphere and the global ocean, form during the Achaean Eon?
This era begins about a billion years after the formation of Earth Mostly everything has cooled down. Most water vapor in the air has cooled and condensed to form a global ocean. Even most of the carbon dioxide is gone, having been chemically changed into limestone and deposited at the bottom of the ocean. The air is now mostly nitrogen, and the sky is filled with normal clouds and rain.
The earth with the cloud of rain was cold, so they made the water. High temperatures lead to outgassing from rocks, and combined with volcanism to produce an atmosphere high in methane, with hydrogen, nitrogen, water vapor and smaller amounts of carbon dioxide and noble gases made the atmosphere.
It started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times as high as it is today, and it was still twice the current level at the transition from the Archean to the Proterozoi. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean (Eoarchean Era), and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old. Archean greenstone-granite belts contain many economic mineral deposits, including gold and silver. The implication is that at this time the entire Earth was covered by ocean.
The Archean eon started after the 4G after the Hadean eon, this was the earth stage of flowing heat and the extra heat was the result of a mix of remnant heat from planetary accretion. During this stage many minerals were created such as Komatiite and granite. This was the creation stages of igneous and metamorphic rocks. So then condensed cooled clouds of rain, which created many of the waters.
The Archean eon, which preceded the Phanerozoic eon, spanned about 1.5 billion years. It was also after the Hadean eon. Everything is starting to cool down from the crazy Hadean eon and that is how the global ocean formed, once the heat left then all the water on the earth rained down making a big ocean. Then all the different gases started to leave which created the atmosphere later trapping all the gases in such as nitrogen and oxygen. When it started to cool down, rocks were also formed and that is why we have a lot more fossils from this eon than from the Hadean eon.
The Anchneaen eon began about a billon years after the formation of earth. Around this time the earth was in a stage of flowing heat and extra heat was the rest of a mix of remnant heat from planetary accretion. The sky is filled with clouds and rain, and the air is mostly nitrogen.
The Archean eon began nearly a billion years ago after the formation of Earth itself. A lot of the Carbon Dioxide is gone now, but it had been changed into other things such as limestone, and it was deposited at the bottom of our oceans. Today, most of the air is nitrogen.
The archean eon began about 3.7 billion years ago when the earth was beginning to cool down. The oceans were starting to form, and there was nitrogen gas in the air. The carbon dioxide was in the water
The Archean eon spanned about 1.5 billion years and started about 4 billion years ago. This time period is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago), Mesoarchean (3.2 to 2.8 billion years ago), Paleoarchean (3.6 to 3.2 billion years ago), and Eoarchean (4 to 3.6 billion years ago). The atmosphere consisted of many gases that would be toxic to most life on our planet today like methane and ammonia. While the planet was mostly molten and too hot for a lot of complex life, it was during this time that the Earth's crust cooled enough that rocks and continental plates were able to begin to form. The only life on the planet during this time period is thought to be bacteria.
The cold rain formed water and started more than 3.8 billion years ago and ended around 2.5 billion years ago. After the Archean eon, everything cooled down and a lot of minerals and rocks were produced.
The Archean eon happened 3.8 billion years ago and lasted until about 2.5 billion years ago. Earth was able to start forming the atmosphere and everything after the heavy bombardment of the hadeon eon ended http://essayweb.net/geology/timeline/archean.shtml
The Achaean Eon happened about 4-2.5 billion years ago, when “methane droplets in the air shrouded the young Earth in a global haze.” During this time, there was no oxygen in the atmosphere. The early atmosphere was mostly (80%) Carbon Dioxide with the addition of various gases such as sulfur dioxide, methane, ammonia, hydrogen, and nitrogen. For the next billion years, photosynthesis proceeded on a small scale and didn’t produce enough oxygen to really make a change in the atmosphere. Then, cyanobacteria began appearing in the oceans (about 2.7 billion years ago). The cyanobacteria began producing oxygen in large quantities, but were used in oxidizing large amounts of iron salts… so this didn’t help at first either. Eventually, the “oxygen sinks” became exhausted of receiving oxygen, which is why it started to appear in the atmosphere for the first time. This event is known as the Great Oxygenation Event.
The Archean ean started about 1.2 billion years after earths formation as life emerged the planets crust cooled down and could sand gases with earths atmosphere created water as earth formed to what it is now shifting as we go
The archaean eon began approximately a billion years after the earth's formation. All the different gases started to leave and that's how the atmosphere trapped gases like nitrogen and CO2. The oceans were from all the excess water and rain!
The Achean Eon began 3.8 billion years ago and lasted until approximately 2.5 billion years ago. The continental crust began to form from the igneous rock in the oceanic crust once the crust had started to cool. Lighter density materials began to float towards earth's surface to become our atmosphere. 3.7 billion years ago continents began to form from smaller peices coming together. There was much water vapor in the atmosphere and once that built up enough the rain began to fall which filled what are now the oceans of the earth. Constant erupting volcanoes broke through the ocean floor forming more land masses.
3. Earth formed a few billion years ago and life was later formed as a result of many different things. The earths heat flow was way hotter than it is today and it was also hotter during the transition from the Archean to the Proterozol. Life could be found on earth around three and a half billion years ago.
2.5 million years agodistance of the Earth from the Sun, probably did not contribute any water to the Earth because the solar nebula was too hot for ice to form and the hydration of rocks by water vapor would have taken too long.[45][47] The water must have been supplied by meteorites from the outer asteroid belt and some large planetary embryos from beyond.the planet cooled, clouds formed. Rain created the oceans
The Archean Eon stretched from 2.5 billion years to 3.8 billion years ago. The Archean Eon, Earth's atmosphere was composed of methane, ammonia, hydrogen, and carbon monoxide, which would be unbreatheable by living organisms today.
It began 3.8 billion years ago and then lasted until 2.5 billions years. Considering the increased temperature of the nebula at that time, you can rule out any ice formations or hydra actions from rocks and sediment. The main theory is the water was brought to earth by meteorites and oceans formed over time through the cooling of the planet and the water cycle beginning.
The Archaean Eon occurred about 4 billion years ago, after the Hadean Eon. The Eon is split into four time periods. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground, but there is a heated debate about this topic.
The Archean eon, which began approximately 4 billion years ago, marked a time when the Earth was still in a very chaotic state; however, there were some unicellular organisms (primitive life) that survived. Some theories as to how the water got on the surface include asteroid strikes that bombarded the surface. Since many asteroid contain frozen material when in the comet stage, collision with the Earth causes that material to settle on the surface. Another theory includes volcano explosions that result in the combination of hydrogen and oxygen. Since the two elements have an affinity for each other, they have the potential to bond together very easily, thus resulting in a possible creation of H2O or what is also known as water. The atmosphere formed because of droplets in the air that could not settle. Global oceans were formed by the process explained above.
The Archaean Eon started about 3.8 billion years ago, right after the Hadean Eon, and it ended 2.5 billion years ago. Water and rain started coming, causing oceans to occur. Oxygen was not fully in the atmosphere at the time, with other gases such as ammonia and nitrogen on the atmosphere.
The Achaean Eon occurred from 3.9 to 2.5 billion years ago. The atmosphere formed by the amount of greenhouse gases there were in this Eon surrounding Earth. Water vapor was abundant during the start of the Eon and began to form large oceans in the process. The Earth was cooling down and made the crust less hot giving the surface to start producing life.
The Archena eon occurred 3.8 to 2.5 billion years ago. The cold rain turned into water, high temps mad out gassing from rocks which lead to atmosphere high In methane, hydrogen, nitrogen, and water vapor with carbon dioxide and noble gasses which made the atmospher.
The Achean Eon occurred before the Proterozoic Eon. It is believed that during the Archean Eon, tectonic activity was more vigorous shifting the surface of the Earth. There is debate about the amount of crust that was present during the this eon, there are small proto-continents believed to have formed towards the end of the Eon
The Archena eon was about a billion years ago and it took place after the Hadeon eon, the earth is now in the cooling stage and the oceans are forming. The atmosphere is also in the process of forming and we find most of our fossils from this era in rocks
The Archean Eon occurred about 4.8 billion years ago, and lasted for about 2.8 billion years. At first, there was no ocean because the earth was extremely hot, but as it cooled to about room temperature, water condensed on the surface, forming the vast ocean. As this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen began to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere. Towards the end of the eon, iron ores began to be formed underneath the oceans, causing oxygen to be introduced to allow advances life.
The Archean Eon occurred about 4 billion years ago and at first the earth was too hot for water and too hot to sustain life, water vapor started to make large bodies of water during the Eon and the earth started to cool to room temperature, it formed a crust and was then sustainable for life.
The Archean Eon occurred about 4 billion years ago. The Earth used to be extremely hot and during the process the water started cooling to form oceans. As the Earth started cooling down the crust also cooled down which made Earth suitable for life.
The oceans were formed when the earth had been cooling for nearly a billion years after being very hot from forming. Water from clouds rained down tons of water which formed the oceans. The atmosphere formed when many volcanoes were erupting and hot gasses were being trapped and built up.
The Archean eon preceded the Phanerozoic eon and lasted about 1.5 billion years. After the Hadean eon, Earth began to cool down and the heat began to escape resulting in heavy rains that flooded the Earth. This also resulted in the formation of an atmosphere
The Archean started 4 billion years ago. Volcanoes spewed carbon dioxide and water vapor into the air, however oxygen was not in abundance until later in the Archean when the first algae and prokaryotes evolved. The oceans formed when the water expelled from volcanoes collected in certain areas.
The Archean Eon formed roughly 4 billion years ago. The Earth was too hot at first, but it cooled down enough for water to form oceans. Carbon and sulfur dioxide started to dissolve into the water, while nitrogen was starting to form in the atmosphere.
The Archean eon happend 3 billion years ago and there was no way for life to evolve or be created during this era because the earths core was way to hot to sustain any living thing.
About 3.8 billion years ago is when it started. Most of the vapors in the atmosphere cooled to creat the oceans that were believed to cover the entire surface of Earth.
2.5 billion years ago. The earth just started to cool off enough for the continental crust to form. As far as the atmosphere goes, humans would be unable to survive because the air was toxic. Since the earth started to cool, water vapor became water which created the worlds oceans
3. The Archean eon spanned about 1.5 billion years and is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago), Mesoarchean (3.2 to 2.8 billion years ago), Paleoarchean (3.6 to 3.2 billion years ago), and Eoarchean (4 to 3.6 billion years ago). The atmosphere was very different – it was likely an atmosphere of methane, ammonia, and other gases, which would be toxic to most life on our planet today. Also during this time, the Earth's crust cooled enough that rocks and continental plates began to form. It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils. In fact, all life during the more than one billion years of the Archean was bacterial.
The Archean eon started about a billion years after the earth was formed, which was about 4 billion years ago. Earth was in the process of cooling down and water vapor was in abundance so oceans began to form around the planet. There were very heavy rains during this time period which flooded parts of the planet creating oceans. There was also very heavy volcanic activity which made an abundance of carbon dioxide and oxygen. The surface began to cool down, making earth suitable for life.
Archaean eon is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion years), or 2,500 million years ago. The atmosphere consisted of many gases that would be toxic to most life on our planet today like methane and ammonia. While the planet was mostly molten and too hot for a lot of complex life, it was during this time that the Earth's crust cooled enough that rocks.
The Archean occurred over 2,500 million years ago, these things were all formed by Volcanic outgassing probably created the primordial atmosphere, but it contained almost no oxygen and would have been toxic to humans and most modern life and over timed the planet cooled allowing a crust to form which allowed water to exist on the surface. Plate tectonics had a lot to do with the atmosphere of the earth.
The Archean Eon occurred 3.8 billion years ago. After the Hadean eon and Archean eon the planet began to cool down, once the heat left then all the water on the earth rained down making a big ocean. Later the same thing happened with some gases some left and helped create the atmosphere and some were trapped with in.
The Archean Eon formed with the cooling of the Earth’s volcanic crust after the Hadean Eon passed. The Archean Eon is responsible for the emergence of oceans and the atmosphere. Archean oceans were created by the condensation of water coming from outgassing volcanoes. The caused a iron release into the oceans from submarine volcanoes in oceanic ridges and during the creation of thick oceanic plateaus. During this time carbon dioxide was emitted constantly from the volcanoes causing the gas to be condensed in the atmosphere, leading to a greenhouse effect and preventing the surface from developing glaciers. Over time the carbon dioxide was released into organic sediments to provide increasing amounts of oxygen into the atmosphere to help sustain life.
The Archean Eon was 400-2500 million years ago. The atmosphere formed from volcanic activity, spewing carbon dioxide to create the atmosphere. The oceans formed from comet impacts, depositing their ice for millions of years, until enough water collected to form the oceans.
The Archean Eon occurred about 4 billion years ago. The Earth was very hot but as it cooled water condensed on the surface and formed an ocean. As this was occurring carbon and sulfur dioxide dissolved into the water taking these elements out of a lot of the atmosphere. Towards the end of the eon, iron ores began to be formed underneath the oceans, causing oxygen to be introduced to allow advances life.
According to most estimations the Archean Eon began about 3.8 billion years ago. The period began just after the Hadean Eon. The global ocean is a body of water which moves or shifts constantly. This is because of thermohaline shifts. The fluid part of earth is a molten mixture of iron, nickel and other metals. This formed beneath earths crust over many years though intense heat via a radio active zone. Earths atmosphere was formed from many volcanoes which relapsed carbon and dicarbon monoxide along whith other elements
The Achaean Eon occured about 3.8 to 2.5 billion years ago. The Achean Eon began after the Hadean Eon concluded. During the Achaean Eon bacteria began to form due to the creation of the oceans. The oceans were created due to comet impacts during the early stages of the Earth's formation. The creation of the oceans allowed bacteria to grow and multiply. This bacteria used ammonia, methane, and sulfates as energy. As the bacteria grew and mutliplied, photosynthesis became common. Through photosynthesis, oxygen was released into the atmosphere. This allowed Earth's atmosphere to diversify and become more capable of supporting more complex life. This combined with the release of gas by volcanoes on the Earth's surface helped form the diverse atmosphere that encompasses earth today.
The Achaean eon occurred roughly 3-4 billion years ago. Life could not be sustained just yet because the core was too hot to support any life. However, bacteria and other small organisms began to form. Oxygen was released into the atmosphere by photosynthesis and the oceans were created by comet impact.
The Archean eon was about 3-4billion years ago. During the Archean Eon, methane drops in the air Fell down on Earth. There was no oxygen gas on Earth. Oxygen was only in compounds such as water. Complex chemical reactions in the new oceans transformed carbon-containing molecules into simple, living cells that did not need oxygen to live. Instead they made energy out of sulfur and other elements.
The Achaean Eon began about 3.8 billion years ago and ended about 2.5 billion years ago. The next eon that occurred was Protero -zion. One thing that probably created the primordial atmosphere was volcanic gasses, but it contained no oxygen which was too toxic to humans and most modern life. Most of the Earth was molten rock because of extreme volcanic and frequent collisions with other bodies of rock. One very large collision by theia is thought to have been responsible for tilting the Earth at an angle and forming the Moon. Everything on Earth was changed by the different actions of other bodies of rock.
The Archean Eon occurred about 4.8 billion years ago, and lasted for about 2.8 billion years. When it first began, there was no ocean because the earth was so hot. When the earth cooled to room temperature, water appeared on the surface. Once this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen began to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere. Towards the end of the eon, iron ores began to form under the oceans. This caused oxygen to allow advances in life.
The Archean era occurred between 3.8 and 2.5 million years ago. Water vapor in the air cooled and condensed to form the global ocean. Oxygen formed in the atmosphere formed from from carbon dioxide, water, and sunlight.
The Archean Eon began about 4 billion years ago with the formation of the Earth's crust. The Earth was very hot but as it cooled water condensed on the surface and formed an ocean. There was also very heavy volcanic activity which made an abundance of carbon dioxide and oxygen. The surface began to cool down, making earth suitable for life.
The Archean eon happened about 3.8 billion years ago. This resulted in the formation of life on our planet. The Archean eon ended about 2.5 billion years ago. The cold rain turned into water, the earths temperature began to cool down. This resulted in the forming of oceans and also rocks and minerals.
The Archean Eon occurred approximately 4 billion years ago when the earth was very very hot. As it cooled water condensed on the surface and formed an ocean. Towards the end of the eon, iron ores formed underneath the oceans, which caused allowed for oxygen to be introduced and help foster advanced life.
The Archean Era began 1 billion years after the creation of the earth, so about 4 billion years ago. Iron ores formed under the oceans which caused oxygen to be created. As the earth cooled, water condensed on the surface which created the oceans.
The Archeon Era lasted from about 4 billions years ago to 2.5 billion years ago. The majority of the planet was molten, but during this time the earth cooled, forming rocks. Bacteria was the only life supported around this time.
The qualities that Earth has that make it support a complex multicellular life planet, is that it acquired an improbable combination of astrophysical and geological events and circumstances.
The Archean eon occurred 3.8 billion to 2.5 billion years ago. The oceans were formed as the earth cooled and condensed water that was on the surface. The atmosphere was formed because gases from volcanic activity began to rise and got trapped.
The Archean eon happened 3.8 billion years ago and lasted until about 2.5 billion years ago. The global oceans occurred as the surface began to cool and water began to condense and collect on the surface.
The Archean eon occurred customarily starts at 4 Ga, which was at the end of the Hadean Eon. It is one of the four principal eons of earth history. When the Archean eon began, the Earth's heat flow was nearly three times as high as it is today. It was still twice the current level at the transition from the Archean to the Proterozoic eon. Volcanic activity was much higher then than it is now, so the atmosphere was full of volcanic gasses. Water vapor was abundant and because of that the first oceans had formed. Complex chemical reactions in these early oceans transformed carbon-containing molecules into single-celled life forms. All life today is descended from these organisms.
The Archaea Eon occurred 3.8 billion years ago. Earth was too hot at first, but the atmosphere cooled, which created the oceans. Also, Earth's crust cooled enough that rocks and continental plates began to form. Oceans were likely created by the condensation of water derived from the outgassing of abundant volcanoes. As a result, iron formed under Earth's crust, and as gases from the volcanic activity began to rise, the gases got trapped, which created oxygen, which make it sustainable for life.
The Archaean Eon occured 4.6 to 3.8 billion years ago. The earth then began to cool forming the crust followed by rain and water vapor which created the oceans. Nitrogen formed in the atmosphere and volcanoes released gases that contributed to the atmosphere. Iron ores formed under the oceans which then led to oxygen.
The archaean eon was about 3.8 billion years ago, it started right after the Hadean Eon. The Earth was mainly covered with large bodies of water like oceans. There was little oxygen but there was more carbon dioxide in the atmosphere. Since it was right after the Hadean eon, the only land masses were volcanoes. The Archean Eon was when the Earth’s crust was beginning to cool and the plates and sedimentary rocks started to form. The oceans were formed from the rain of carbon dioxide.
The Archean Eon happened about 4 billion years ago. The earth was very hot when this happened and as it cooled the water condensed on the surface, which is now what is known as the ocean. As the eon came to its end iron ores formed beneath the oceans that caused oxygen to be introduced and helped advance life.
The Archena eon occurred 3.8 to 2.5 billion years ago. The cold rain turned into water, high temps mad out gassing from rocks which lead to atmosphere high In methane, hydrogen, nitrogen, and water vapor with carbon dioxide and noble gasses which made the atmospher.
The Archean Eon was about 3.8 billion years ago, right after the Haden eon. Earths as covered with large bodies of water, similar to today's oceans. There way very little oxygen during this time, there was more carbon dioxide in the atmosphere. Because it was right after the Haden Eon, the only land masses we had were volcanoes. The oceans were formed from carbon dioxide and rain.
The Archean Eon was 4 billion years ago and the earth was predominately covered in water then. The land masses were volcanoes because earth's crust was just beginning to cool. Bacteria was the only life supported at this time.
The Archean Eon is believed to have occurred at 4 Ga, which is after the Hadean Eon. The clouds of rain formed the water and gases that emerged formed the atmosphere.
The Archean eon, which preceded the Phanerozoic eon, spanned about 1.5 billion years. It was also after the Hadean eon. Everything is starting to cool down from the crazy Hadean eon and that is how the global ocean formed, once the heat left then all the water on the earth rained down making a big ocean.
The Archean Eon started around 4 billion years ago and at this time the earth was mostly covered in water. Once all the heat from the hadeon ended it turned into a lot of rain and formed the oceans
It began 3.8 billion years ago and ended around 2.5 billion years ago. the oceans formed due to the cooling of earths surface, mixed with the rainfall on earths surface which was the result of cooling after volcanic activity which also contributed to the formation of earths atmospheric composition
It started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times that of now. The Proterozoi era was the next era. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean , and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old. Archean greenstone-granite belts contain many economic mineral deposits, including gold and silver. The implication is that at this time the entire Earth was covered by ocean.
The Archean eon happened 4 billion years ago and the only land features were volcanos. The only life was bacteria and there was only really water on earth during this time.
eon started about 3.8 billion years ago and ended about 2.5 billion years ago. The oceans started to form when the cooling of earths surface started to take place, which eventually led to rainfall cooling down a lot of valcanoes which also contributed to earths atmosphere
The Archean eon started about 3.8 billions years ago and ended 2.5 billion years ago. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground.
The Archean eon started about 3.8 billions years ago and ended 2.5 billion years ago. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground.
A mineral is a compound of different organic elements making it have its own chemical compound but a rock is made up of only one element or maybe a mix of two.
The Archean Eon started about 4.8 billion years ago, ended about 2.8 billion years later. There was no ocean because the earth was really hot, it cooled to about room temperature and water condensed on the surface, forming the vast ocean. As this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen started to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere.
It started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times as high as it is today, and it was still twice the current level at the transition from the Archean to the Proterozoi. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean (Eoarchean Era), and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old.
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ReplyDeleteThis era begins about a billion years after the formation of Earth Mostly everything has cooled down. Most water vapor in the air has cooled and condensed to form a global ocean. Even most of the carbon dioxide is gone, having been chemically changed into limestone and deposited at the bottom of the ocean. The air is now mostly nitrogen, and the sky is filled with normal clouds and rain.
ReplyDeleteThe earth with the cloud of rain was cold, so they made the water. High temperatures lead to outgassing from rocks, and combined with volcanism to produce an atmosphere high in methane, with hydrogen, nitrogen, water vapor and smaller amounts of carbon dioxide and noble gases made the atmosphere.
ReplyDelete3.8 to 2.5 billion years ago.
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ReplyDeleteIt started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times as high as it is today, and it was still twice the current level at the transition from the Archean to the Proterozoi. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean (Eoarchean Era), and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old. Archean greenstone-granite belts contain many economic mineral deposits, including gold and silver. The implication is that at this time the entire Earth was covered by ocean.
ReplyDeleteThe Archean eon started after the 4G after the Hadean eon, this was the earth stage of flowing heat and the extra heat was the result of a mix of remnant heat from planetary accretion. During this stage many minerals were created such as Komatiite and granite. This was the creation stages of igneous and metamorphic rocks. So then condensed cooled clouds of rain, which created many of the waters.
ReplyDeleteWater was formed by cold rain and the atmosphere was made by volcanos erupting constantly with high in gas. Methane to be exact.
ReplyDeleteThe Archean eon, which preceded the Phanerozoic eon, spanned about 1.5 billion years. It was also after the Hadean eon. Everything is starting to cool down from the crazy Hadean eon and that is how the global ocean formed, once the heat left then all the water on the earth rained down making a big ocean. Then all the different gases started to leave which created the atmosphere later trapping all the gases in such as nitrogen and oxygen. When it started to cool down, rocks were also formed and that is why we have a lot more fossils from this eon than from the Hadean eon.
ReplyDeleteThe Anchneaen eon began about a billon years after the formation of earth. Around this time the earth was in a stage of flowing heat and extra heat was the rest of a mix of remnant heat from planetary accretion. The sky is filled with clouds and rain, and the air is mostly nitrogen.
ReplyDeleteThe Archean eon began nearly a billion years ago after the formation of Earth itself. A lot of the Carbon Dioxide is gone now, but it had been changed into other things such as limestone, and it was deposited at the bottom of our oceans. Today, most of the air is nitrogen.
ReplyDeletethe Archean eon started around 4 billion years ago and it cooled down the hadeon and hot earth to form the oceans we have today
ReplyDeleteThe archean eon began about 3.7 billion years ago when the earth was beginning to cool down. The oceans were starting to form, and there was nitrogen gas in the air. The carbon dioxide was in the water
ReplyDeleteThe Archean eon spanned about 1.5 billion years and started about 4 billion years ago. This time period is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago), Mesoarchean (3.2 to 2.8 billion years ago), Paleoarchean (3.6 to 3.2 billion years ago), and Eoarchean (4 to 3.6 billion years ago). The atmosphere consisted of many gases that would be toxic to most life on our planet today like methane and ammonia. While the planet was mostly molten and too hot for a lot of complex life, it was during this time that the Earth's crust cooled enough that rocks and continental plates were able to begin to form. The only life on the planet during this time period is thought to be bacteria.
ReplyDeleteThe cold rain formed water and started more than 3.8 billion years ago and ended around 2.5 billion years ago. After the Archean eon, everything cooled down and a lot of minerals and rocks were produced.
ReplyDeleteThe Archean eon happened 3.8 billion years ago and lasted until about 2.5 billion years ago. Earth was able to start forming the atmosphere and everything after the heavy bombardment of the hadeon eon ended
ReplyDeletehttp://essayweb.net/geology/timeline/archean.shtml
The Achaean Eon happened about 4-2.5 billion years ago, when “methane droplets in the air shrouded the young Earth in a global haze.” During this time, there was no oxygen in the atmosphere. The early atmosphere was mostly (80%) Carbon Dioxide with the addition of various gases such as sulfur dioxide, methane, ammonia, hydrogen, and nitrogen. For the next billion years, photosynthesis proceeded on a small scale and didn’t produce enough oxygen to really make a change in the atmosphere. Then, cyanobacteria began appearing in the oceans (about 2.7 billion years ago). The cyanobacteria began producing oxygen in large quantities, but were used in oxidizing large amounts of iron salts… so this didn’t help at first either. Eventually, the “oxygen sinks” became exhausted of receiving oxygen, which is why it started to appear in the atmosphere for the first time. This event is known as the Great Oxygenation Event.
ReplyDeleteThe Archean ean started about 1.2 billion years after earths formation as life emerged the planets crust cooled down and could sand gases with earths atmosphere created water as earth formed to what it is now shifting as we go
ReplyDeleteThe archaean eon began approximately a billion years after the earth's formation. All the different gases started to leave and that's how the atmosphere trapped gases like nitrogen and CO2. The oceans were from all the excess water and rain!
ReplyDeleteThe Achean Eon began 3.8 billion years ago and lasted until approximately 2.5 billion years ago. The continental crust began to form from the igneous rock in the oceanic crust once the crust had started to cool. Lighter density materials began to float towards earth's surface to become our atmosphere. 3.7 billion years ago continents began to form from smaller peices coming together. There was much water vapor in the atmosphere and once that built up enough the rain began to fall which filled what are now the oceans of the earth. Constant erupting volcanoes broke through the ocean floor forming more land masses.
ReplyDelete3. Earth formed a few billion years ago and life was later formed as a result of many different things. The earths heat flow was way hotter than it is today and it was also hotter during the transition from the Archean to the Proterozol. Life could be found on earth around three and a half billion years ago.
ReplyDelete2.5 million years agodistance of the Earth from the Sun, probably did not contribute any water to the Earth because the solar nebula was too hot for ice to form and the hydration of rocks by water vapor would have taken too long.[45][47] The water must have been supplied by meteorites from the outer asteroid belt and some large planetary embryos from beyond.the planet cooled, clouds formed. Rain created the oceans
ReplyDeleteThe Archean Eon stretched from 2.5 billion years to 3.8 billion years ago. The Archean Eon, Earth's atmosphere was composed of methane, ammonia, hydrogen, and carbon monoxide, which would be unbreatheable by living organisms today.
ReplyDeleteIt began 3.8 billion years ago and then lasted until 2.5 billions years. Considering the increased temperature of the nebula at that time, you can rule out any ice formations or hydra actions from rocks and sediment. The main theory is the water was brought to earth by meteorites and oceans formed over time through the cooling of the planet and the water cycle beginning.
ReplyDeleteThe Archaean Eon occurred about 4 billion years ago, after the Hadean Eon. The Eon is split into four time periods. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground, but there is a heated debate about this topic.
ReplyDeleteThe Archean eon, which began approximately 4 billion years ago, marked a time when the Earth was still in a very chaotic state; however, there were some unicellular organisms (primitive life) that survived. Some theories as to how the water got on the surface include asteroid strikes that bombarded the surface. Since many asteroid contain frozen material when in the comet stage, collision with the Earth causes that material to settle on the surface. Another theory includes volcano explosions that result in the combination of hydrogen and oxygen. Since the two elements have an affinity for each other, they have the potential to bond together very easily, thus resulting in a possible creation of H2O or what is also known as water. The atmosphere formed because of droplets in the air that could not settle. Global oceans were formed by the process explained above.
ReplyDeleteThe Archaean Eon started about 3.8 billion years ago, right after the Hadean Eon, and it ended 2.5 billion years ago. Water and rain started coming, causing oceans to occur. Oxygen was not fully in the atmosphere at the time, with other gases such as ammonia and nitrogen on the atmosphere.
ReplyDeleteThe Achaean Eon occurred from 3.9 to 2.5 billion years ago. The atmosphere formed by the amount of greenhouse gases there were in this Eon surrounding Earth. Water vapor was abundant during the start of the Eon and began to form large oceans in the process. The Earth was cooling down and made the crust less hot giving the surface to start producing life.
ReplyDeleteThe Archena eon occurred 3.8 to 2.5 billion years ago. The cold rain turned into water, high temps mad out gassing from rocks which lead to atmosphere high In methane, hydrogen, nitrogen, and water vapor with carbon dioxide and noble gasses which made the atmospher.
ReplyDeleteThe Achean Eon occurred before the Proterozoic Eon. It is believed that during the Archean Eon, tectonic activity was more vigorous shifting the surface of the Earth. There is debate about the amount of crust that was present during the this eon, there are small proto-continents believed to have formed towards the end of the Eon
ReplyDeleteThe Archena eon was about a billion years ago and it took place after the Hadeon eon, the earth is now in the cooling stage and the oceans are forming. The atmosphere is also in the process of forming and we find most of our fossils from this era in rocks
ReplyDeleteThe Archean Eon occurred about 4.8 billion years ago, and lasted for about 2.8 billion years. At first, there was no ocean because the earth was extremely hot, but as it cooled to about room temperature, water condensed on the surface, forming the vast ocean. As this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen began to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere. Towards the end of the eon, iron ores began to be formed underneath the oceans, causing oxygen to be introduced to allow advances life.
ReplyDeleteThe Archean Eon occurred about 4 billion years ago and at first the earth was too hot for water and too hot to sustain life, water vapor started to make large bodies of water during the Eon and the earth started to cool to room temperature, it formed a crust and was then sustainable for life.
ReplyDeleteThe Archean Eon occurred about 4 billion years ago. The Earth used to be extremely hot and during the process the water started cooling to form oceans. As the Earth started cooling down the crust also cooled down which made Earth suitable for life.
ReplyDeleteThe oceans were formed when the earth had been cooling for nearly a billion years after being very hot from forming. Water from clouds rained down tons of water which formed the oceans. The atmosphere formed when many volcanoes were erupting and hot gasses were being trapped and built up.
ReplyDeleteThe Archean eon preceded the Phanerozoic eon and lasted about 1.5 billion years. After the Hadean eon, Earth began to cool down and the heat began to escape resulting in heavy rains that flooded the Earth. This also resulted in the formation of an atmosphere
ReplyDeleteThe Archean started 4 billion years ago. Volcanoes spewed carbon dioxide and water vapor into the air, however oxygen was not in abundance until later in the Archean when the first algae and prokaryotes evolved. The oceans formed when the water expelled from volcanoes collected in certain areas.
ReplyDeleteThe Archean Eon formed roughly 4 billion years ago. The Earth was too hot at first, but it cooled down enough for water to form oceans. Carbon and sulfur dioxide started to dissolve into the water, while nitrogen was starting to form in the atmosphere.
ReplyDeleteThe Archean eon happend 3 billion years ago and there was no way for life to evolve or be created during this era because the earths core was way to hot to sustain any living thing.
ReplyDeleteAbout 3.8 billion years ago is when it started. Most of the vapors in the atmosphere cooled to creat the oceans that were believed to cover the entire surface of Earth.
ReplyDelete2.5 billion years ago. The earth just started to cool off enough for the continental crust to form. As far as the atmosphere goes, humans would be unable to survive because the air was toxic. Since the earth started to cool, water vapor became water which created the worlds oceans
ReplyDelete3. The Archean eon spanned about 1.5 billion years and is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago), Mesoarchean (3.2 to 2.8 billion years ago), Paleoarchean (3.6 to 3.2 billion years ago), and Eoarchean (4 to 3.6 billion years ago). The atmosphere was very different – it was likely an atmosphere of methane, ammonia, and other gases, which would be toxic to most life on our planet today. Also during this time, the Earth's crust cooled enough that rocks and continental plates began to form. It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils. In fact, all life during the more than one billion years of the Archean was bacterial.
ReplyDeletehttp://www.ucmp.berkeley.edu/precambrian/archean_hadean.php
DeleteThe Archean eon started about a billion years after the earth was formed, which was about 4 billion years ago. Earth was in the process of cooling down and water vapor was in abundance so oceans began to form around the planet. There were very heavy rains during this time period which flooded parts of the planet creating oceans. There was also very heavy volcanic activity which made an abundance of carbon dioxide and oxygen. The surface began to cool down, making earth suitable for life.
ReplyDeleteArchaean eon is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion years), or 2,500 million years ago. The atmosphere consisted of many gases that would be toxic to most life on our planet today like methane and ammonia. While the planet was mostly molten and too hot for a lot of complex life, it was during this time that the Earth's crust cooled enough that rocks.
ReplyDeleteThe Archean occurred over 2,500 million years ago, these things were all formed by Volcanic outgassing probably created the primordial atmosphere, but it contained almost no oxygen and would have been toxic to humans and most modern life and over timed the planet cooled allowing a crust to form which allowed water to exist on the surface. Plate tectonics had a lot to do with the atmosphere of the earth.
ReplyDeleteThe Archean Eon occurred 3.8 billion years ago.
ReplyDeleteAfter the Hadean eon and Archean eon the planet began to cool down, once the heat left then all the water on the earth rained down making a big ocean. Later the same thing happened with some gases some left and helped create the atmosphere and some were trapped with in.
The Archean Eon formed with the cooling of the Earth’s volcanic crust after the Hadean Eon passed. The Archean Eon is responsible for the emergence of oceans and the atmosphere. Archean oceans were created by the condensation of water coming from outgassing volcanoes. The caused a iron release into the oceans from submarine volcanoes in oceanic ridges and during the creation of thick oceanic plateaus. During this time carbon dioxide was emitted constantly from the volcanoes causing the gas to be condensed in the atmosphere, leading to a greenhouse effect and preventing the surface from developing glaciers. Over time the carbon dioxide was released into organic sediments to provide increasing amounts of oxygen into the atmosphere to help sustain life.
ReplyDeleteThe Archean Eon was 400-2500 million years ago. The atmosphere formed from volcanic activity, spewing carbon dioxide to create the atmosphere. The oceans formed from comet impacts, depositing their ice for millions of years, until enough water collected to form the oceans.
ReplyDeleteThe Archean Eon occurred about 4 billion years ago. The Earth was very hot but as it cooled water condensed on the surface and formed an ocean. As this was occurring carbon and sulfur dioxide dissolved into the water taking these elements out of a lot of the atmosphere. Towards the end of the eon, iron ores began to be formed underneath the oceans, causing oxygen to be introduced to allow advances life.
ReplyDeleteAccording to most estimations the Archean Eon began about 3.8 billion years ago. The period began just after the Hadean Eon. The global ocean is a body of water which moves or shifts constantly. This is because of thermohaline shifts. The fluid part of earth is a molten mixture of iron, nickel and other metals. This formed beneath earths crust over many years though intense heat via a radio active zone. Earths atmosphere was formed from many volcanoes which relapsed carbon and dicarbon monoxide along whith other elements
ReplyDeleteThe Achaean Eon occured about 3.8 to 2.5 billion years ago. The Achean Eon began after the Hadean Eon concluded. During the Achaean Eon bacteria began to form due to the creation of the oceans. The oceans were created due to comet impacts during the early stages of the Earth's formation. The creation of the oceans allowed bacteria to grow and multiply. This bacteria used ammonia, methane, and sulfates as energy. As the bacteria grew and mutliplied, photosynthesis became common. Through photosynthesis, oxygen was released into the atmosphere. This allowed Earth's atmosphere to diversify and become more capable of supporting more complex life. This combined with the release of gas by volcanoes on the Earth's surface helped form the diverse atmosphere that encompasses earth today.
ReplyDeleteThe Achaean eon occurred roughly 3-4 billion years ago. Life could not be sustained just yet because the core was too hot to support any life. However, bacteria and other small organisms began to form. Oxygen was released into the atmosphere by photosynthesis and the oceans were created by comet impact.
ReplyDeleteThe Archean eon was about 3-4billion years ago. During the Archean Eon, methane drops in the air Fell down on Earth. There was no oxygen gas on Earth. Oxygen was only in compounds such as water. Complex chemical reactions in the new oceans transformed carbon-containing molecules into simple, living cells that did not need oxygen to live. Instead they made energy out of sulfur and other elements.
ReplyDeleteThe Achaean Eon began about 3.8 billion years ago and ended about 2.5 billion years ago. The next eon that occurred was Protero -zion. One thing that probably created the primordial atmosphere was volcanic gasses, but it contained no oxygen which was too toxic to humans and most modern life. Most of the Earth was molten rock because of extreme volcanic and frequent collisions with other bodies of rock. One very large collision by theia is thought to have been responsible for tilting the Earth at an angle and forming the Moon. Everything on Earth was changed by the different actions of other bodies of rock.
ReplyDeleteThe Archean Eon occurred about 4.8 billion years ago, and lasted for about 2.8 billion years. When it first began, there was no ocean because the earth was so hot. When the earth cooled to room temperature, water appeared on the surface. Once this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen began to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere. Towards the end of the eon, iron ores began to form under the oceans. This caused oxygen to allow advances in life.
ReplyDeleteThe Archean era occurred between 3.8 and 2.5 million years ago. Water vapor in the air cooled and condensed to form the global ocean. Oxygen formed in the atmosphere formed from from carbon dioxide, water, and sunlight.
ReplyDeleteThe Archean Eon began about 4 billion years ago with the formation of the Earth's crust. The Earth was very hot but as it cooled water condensed on the surface and formed an ocean. There was also very heavy volcanic activity which made an abundance of carbon dioxide and oxygen. The surface began to cool down, making earth suitable for life.
ReplyDeleteThe Archean eon happened about 3.8 billion years ago. This resulted in the formation of life on our planet. The Archean eon ended about 2.5 billion years ago. The cold rain turned into water, the earths temperature began to cool down. This resulted in the forming of oceans and also rocks and minerals.
ReplyDeleteThe Archean Eon occurred approximately 4 billion years ago when the earth was very very hot. As it cooled water condensed on the surface and formed an ocean. Towards the end of the eon, iron ores formed underneath the oceans, which caused allowed for oxygen to be introduced and help foster advanced life.
ReplyDeleteThe Archean Era began 1 billion years after the creation of the earth, so about 4 billion years ago. Iron ores formed under the oceans which caused oxygen to be created. As the earth cooled, water condensed on the surface which created the oceans.
ReplyDeleteThe Archeon Era lasted from about 4 billions years ago to 2.5 billion years ago. The majority of the planet was molten, but during this time the earth cooled, forming rocks. Bacteria was the only life supported around this time.
ReplyDeleteThe qualities that Earth has that make it support a complex multicellular life planet, is that it acquired an improbable combination of astrophysical and geological events and circumstances.
ReplyDeleteThe Archean eon occurred 3.8 billion to 2.5 billion years ago. The oceans were formed as the earth cooled and condensed water that was on the surface. The atmosphere was formed because gases from volcanic activity began to rise and got trapped.
ReplyDeleteThe Archean eon happened 3.8 billion years ago and lasted until about 2.5 billion years ago. The global oceans occurred as the surface began to cool and water began to condense and collect on the surface.
ReplyDeleteThe Archean eon occurred customarily starts at 4 Ga, which was at the end of the Hadean Eon. It is one of the four principal eons of earth history. When the Archean eon began, the Earth's heat flow was nearly three times as high as it is today. It was still twice the current level at the transition from the Archean to the Proterozoic eon. Volcanic activity was much higher then than it is now, so the atmosphere was full of volcanic gasses. Water vapor was abundant and because of that the first oceans had formed. Complex chemical reactions in these early oceans transformed carbon-containing molecules into single-celled life forms. All life today is descended from these organisms.
ReplyDeleteThe Archaea Eon occurred 3.8 billion years ago. Earth was too hot at first, but the atmosphere cooled, which created the oceans. Also, Earth's crust cooled enough that rocks and continental plates began to form. Oceans were likely created by the condensation of water derived from the outgassing of abundant volcanoes. As a result, iron formed under Earth's crust, and as gases from the volcanic activity began to rise, the gases got trapped, which created oxygen, which make it sustainable for life.
ReplyDeleteThe Archaean eon occurred 4 billion years ago.
ReplyDeleteAfter it ended, Water and Rain occurred resulting in the formation of oxygen.
The Archaean Eon occured 4.6 to 3.8 billion years ago. The earth then began to cool forming the crust followed by rain and water vapor which created the oceans. Nitrogen formed in the atmosphere and volcanoes released gases that contributed to the atmosphere. Iron ores formed under the oceans which then led to oxygen.
ReplyDeleteThe archaean eon was about 3.8 billion years ago, it started right after the Hadean Eon. The Earth was mainly covered with large bodies of water like oceans. There was little oxygen but there was more carbon dioxide in the atmosphere. Since it was right after the Hadean eon, the only land masses were volcanoes. The Archean Eon was when the Earth’s crust was beginning to cool and the plates and sedimentary rocks started to form. The oceans were formed from the rain of carbon dioxide.
ReplyDeleteThe Archean Eon happened about 4 billion years ago. The earth was very hot when this happened and as it cooled the water condensed on the surface, which is now what is known as the ocean. As the eon came to its end iron ores formed beneath the oceans that caused oxygen to be introduced and helped advance life.
ReplyDeleteThe Archena eon occurred 3.8 to 2.5 billion years ago. The cold rain turned into water, high temps mad out gassing from rocks which lead to atmosphere high In methane, hydrogen, nitrogen, and water vapor with carbon dioxide and noble gasses which made the atmospher.
ReplyDeleteThe Archean Eon was about 3.8 billion years ago, right after the Haden eon. Earths as covered with large bodies of water, similar to today's oceans. There way very little oxygen during this time, there was more carbon dioxide in the atmosphere. Because it was right after the Haden Eon, the only land masses we had were volcanoes. The oceans were formed from carbon dioxide and rain.
ReplyDeleteThe Archean Eon was 4 billion years ago and the earth was predominately covered in water then. The land masses were volcanoes because earth's crust was just beginning to cool. Bacteria was the only life supported at this time.
ReplyDeleteThe Archean Eon is believed to have occurred at 4 Ga, which is after the Hadean Eon. The clouds of rain formed the water and gases that emerged formed the atmosphere.
ReplyDeleteThe Archean eon, which preceded the Phanerozoic eon, spanned about 1.5 billion years. It was also after the Hadean eon. Everything is starting to cool down from the crazy Hadean eon and that is how the global ocean formed, once the heat left then all the water on the earth rained down making a big ocean.
ReplyDeleteThe Archean Eon started around 4 billion years ago and at this time the earth was mostly covered in water. Once all the heat from the hadeon ended it turned into a lot of rain and formed the oceans
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ReplyDeleteIt began 3.8 billion years ago and ended around 2.5 billion years ago. the oceans formed due to the cooling of earths surface, mixed with the rainfall on earths surface which was the result of cooling after volcanic activity which also contributed to the formation of earths atmospheric composition
ReplyDeleteIt started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times that of now. The Proterozoi era was the next era. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean , and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old. Archean greenstone-granite belts contain many economic mineral deposits, including gold and silver. The implication is that at this time the entire Earth was covered by ocean.
ReplyDeleteThe Archean eon happened 4 billion years ago and the only land features were volcanos. The only life was bacteria and there was only really water on earth during this time.
ReplyDeleteeon started about 3.8 billion years ago and ended about 2.5 billion years ago. The oceans started to form when the cooling of earths surface started to take place, which eventually led to rainfall cooling down a lot of valcanoes which also contributed to earths atmosphere
ReplyDeleteThe Archean eon started about 3.8 billions years ago and ended 2.5 billion years ago. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground.
ReplyDeleteThe Archean eon started about 3.8 billions years ago and ended 2.5 billion years ago. The atmosphere during the Archaen Eon was toxic and virtually no life could exist. There were also lots of volcanic activity even in this Eon. The volcanic activities contributed to the formation of the land and solid ground.
ReplyDeleteA mineral is a compound of different organic elements making it have its own chemical compound but a rock is made up of only one element or maybe a mix of two.
ReplyDeleteThe Archean Eon started about 4.8 billion years ago, ended about 2.8 billion years later. There was no ocean because the earth was really hot, it cooled to about room temperature and water condensed on the surface, forming the vast ocean. As this occurred, carbon and sulfur dioxide dissolved into the water, taking these elements out of a lot of the atmosphere. Nitrogen started to form in the atmosphere, and volcanic activity continued to help create a secondary atmosphere.
ReplyDeleteIt started 3.8 billion years ago and ended in 2.5 billion years ago. the Earth's heat flow was nearly three times as high as it is today, and it was still twice the current level at the transition from the Archean to the Proterozoi. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean (Eoarchean Era), and evidence of the earliest primitive life-forms—bacteria and blue-green algae—appears in rocks about 3.5 billion years old.
ReplyDelete