How has Earth's atmosphere changed?
- Created by: nicole beaumont
- Created on: 22-09-18 15:25
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4.6 billion years ago:
>Earth started to cool
>A thin crust formed - there were no oceans at this point
>Periods of extreme volcanic activity released gases (carbon dioxide, Nitrogen, and water vapour)
>oceans began to form when the water vapour condensed and fell as rain.
4 billion years ago:
>The earth began to stabalise
> There were traces of methane and ammonia
3.4 billion years ago:
>The first simple organisms began to form (very much similar to bacteria)
2.7 billion years ago:
>High…
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