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  • The Early volacanos produced gases such as water vapour and co2, hydrogen and methane, these gases formed the early atmosphere this happened 4.6 billion years ago 
  • For the first couple of billion years there was a lot of volcanic activity , the first types of bacteria formed the water vapour had condensed into the oceans.
  • As the first sea life and bacteria formed, the concentration of carbon dioxide decreased and the concentartion of oxygen increased.
  • Other animals started to form which meant they would be respiring, increasing the amount of carbon dioxide
  • Today's atmosphere consits of  78% Nitrogen 21% Oxygen 0.03 carbon dioxide
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