earths atmosphere

earths atmosphere

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  • The earths early atmosphere was formed by volcanic activity
  • scientists think the atmosphere mainly consisted of carbon dioxide, there may also have been nitrogen and water vapour together with traces of methane and a mmonia
  • as plants spread over the earth the levels of oxygen increased 
  • photosynthesis by algae and plants reduced the percentage of carbon dioxide in the early atmosphere
  • the formation of sedimentary rocks and fossil fuels that contain carbon also removed carbon dioxide from the atmosphere 
  • which brings us to today where our atmosphere is 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, 0.04 percent carbon dioxide, and then trace amounts of other gases
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