atomapshere

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atmosphere
- the first atomosphere
  - formed by gasses produced from volcanoes
  - large amounts of co2 and water vapour
  - no oxygen
  - very hot and no oceans
- adding oxygen
  - oceans are formed
    - life begins and photosynthesis occurs
      - oxygen builds up in oceans
        builds up in atomasphere
- removing co2
  - dissolved into oceans
    - marine organisms used the co2 to make shells
      - dead shells fell into sea bed and became part of the sediment
- changing atmosphere
  - 78% nitrogen
  - why?
    - fossil fuel burning realseas co2 and sulphar dioxide
    - cows release methane
    - deofestaton adds co2
      - fewer trees to remove co2
formed sedimentary rock
- dead shells fell into sea bed and became part of the sediment
21% oxygen
- changing atmosphere
  - 78% nitrogen
  - why?
    - fossil fuel burning realseas co2 and sulphar dioxide
    - cows release methane
    - deofestaton adds co2
      - fewer trees to remove co2
0.9% agron

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