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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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