History Earth is believed to have formed about 5 billion years ago. In the first 500 million years a dense atmosphere emerged from the vapor and gases that were expelled during degassing of the planet's interior. These gases may have consisted of hydrogen (H2), water vapor, methane (CH4) , and carbon oxides.he hydrosphere was formed 4 billion years ago from the condensation of water vapor, resulting in oceans of water in which sedimentation occured. The most important feature of the ancient environment was the absence of free oxygen.
http://teachertech.rice.edu/Participants/louviere/history.html
The early atmosphere. Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide with little or no oxygen.There were smaller proportions of water vapour, ammonia and methane.he early atmosphere was probably mostly carbon dioxide with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane.
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/earth/earthsatmosphererev3.shtml
The early atmosphere. Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.The early atmosphere was probably mostly carbon dioxide, with little or no oxygen.There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.t is believed that there was intense volcanic activity for the first billion years of the Earth's existence. The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane.
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/oils/changesrev7.shtml
However, the atmosphere was not always like this. In fact, the atmosphere we know is the third of series of atmospheres that have surrounded our planet. The first atmosphere on Earth, the primary atmosphere, appeared soon after the planet was formed, about 4.5 billion years ago.This atmosphere would have consisted of gases captured from the Sun-hydrogen, helium, ammonia, methane and water vapor-and resembled the atmospheres of the gas giants.n fact, the atmosphere we know is the third of series of atmospheres that have surrounded our planet. The first atmosphere on Earth, the primary atmosphere, appeared soon after the planet was formed, about 4.5 billion years ago.
http://www.earthfacts.com/atmosphere/historyearthatmosphere/
Prior to 3.5 billion years ago the atmosphere probably consisted of carbon dioxide (CO2), carbon monoxide (CO), water (H2O), nitrogen (N2), and hydrogen. The hydrosphere was formed 4 billion years ago from the condensation of water vapor, resulting in oceans of water in which sedimentation occured.The most important feature of the ancient environment was the absence of free oxygen.he hydrosphere was formed 4 billion years ago from the condensation of water vapor, resulting in oceans of water in which sedimentation occured. The most important feature of the ancient environment was the absence of free oxygen.
http://teachertech.rice.edu/Participants/louviere/history.html
Earth’s original atmosphere was probably just hydrogen and helium, because these were the main gases in the dusty, gassy disk around the Sun from which the planets formed. The Earth and its atmosphere were very hot.Molecules of hydrogen and helium move really fast, especially when warm.arth’s original atmosphere was probably just hydrogen and helium, because these were the main gases in the dusty, gassy disk around the Sun from which the planets formed. The Earth and its atmosphere were very hot.
http://scijinks.jpl.nasa.gov/atmosphere-formation/
A second line of evidence, to suggest that the early earth had a reducing atmosphere like Venus and Mars, is the presence of detrital (formed from the products of erosion of pre-existing rocks) pyrite in sedimentary deposits older than two billion years old.owever, in rocks older than two billion years old this mineral (iron pyrite) is found in rocks that were probably formed in streambeds. 1  The possible changing composition of the Earth's atmosphere during its early history is shown in Figure 10.
http://eesc.columbia.edu/courses/ees/climate/lectures/earth.html
The Earth’s first atmosphere was formed by gases produced from volcanoes. The Earth was very hot to start with, and there were no oceans. As the Earth cooled down the water vapour in the atmosphere condensed to form liquid water.This liquid water became the oceans.he Earth’s first atmosphere was formed by gases produced from volcanoes. The Earth was very hot to start with, and there were no oceans. As the Earth cooled down the water vapour in the atmosphere condensed to form liquid water.
http://www.pearsonschoolsandfecolleges.co.uk/AssetsLibrary/SECTORS/Secondary/SUBJECT/Science/PDFs/EdexcelScienceRevision/ScienceRevisionGuide_foundation.pdf
Earth’s early atmosphere contained only small amounts of free oxygen, probably produced entirely by the reaction of sunlight with water vapor from volcanoes.The oxygen-rich atmosphere that evolved later, and upon which oxygen-breathing life now depends, was a result of the origin of photosynthesis.arth’s early atmosphere contained only small amounts of free oxygen, probably produced entirely by the reaction of sunlight with water vapor from volcanoes.
http://paleobiology.si.edu/geotime/main/htmlVersion/proterozoic4.html
It is thought that the atmospheres of Mars and Venus today, which contain mostly carbon dioxide, are similar to the early atmosphere of the Earth.he early atmosphere was probably mostly carbon dioxide with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane.
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/earth/earthsatmosphererev3.shtml
what were the contents of the first atmosphere that was formed
The contents of the first atmosphere that was formed were hydrogen, water vapor, methane, and carbon oxides. Hydrogen or H2, water vapor, methane or CH4 , and carbon oxides were the contents of the first atmosphere that was formed.