changes in atmosphere

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1. over the years, carbon dioxide dissolved in the oceans and this was adsorbed by marine organisms. The marine organisms eventually formed rocks which are

  • nitrogen
  • carbonates
  • argon
  • carbon dioxied
  • neon
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2. over 500 million years ago the earth was covered in

  • land
  • oceans
  • volcanoes
  • lava and molten rock

3. animals evolved using ...

  • carbon dioxide to rispire
  • oxygen to respire
  • oxygen to photosynthesies
  • carbon dioxide to photosynthesies

4. the earliest atmosphere is thought to have contained mainly....

  • carbonates
  • nitrogen
  • argon
  • carbon dioxide
  • neon

5. The Earths atmosphere today contains approximately 78% of...

  • carbonates
  • neon
  • carbon dioxide
  • nitrogen
  • argon

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