Early atmosphere changes (Chemistry)

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Last updated 2:31 PM on 9/26/26
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7 Terms

1
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What was the early Earth atmosphere mostly made of?

Carbon dioxide & water vapour (from volcanoes)

2
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What is today's atmosphere mostly made of?

78% nitrogen, 21% oxygen

3
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How did oceans form?

Earth cooled → water vapour condensed → fell as rain → oceans formed

4
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Why did CO₂ levels decrease? (2 reasons)

1) Dissolved in oceans 2) Used by plants/algae for photosynthesis 3) Locked up in rocks & fossil fuels

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Why did oxygen levels increase?

Plants/algae evolved → photosynthesis released oxygen

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Why did nitrogen levels increase?

Nitrogen is unreactive → built up slowly in the atmosphere

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