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Biological activity

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Angela Veum

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2y ago
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11y ago

This was an abrupt change caused by algae discovering photosynthesis. The magic here is using photosynthesis to split water into H and O. The H molecyles are used by the plant to make carbohydrates, and the O is discharged as a waste gas. The oxygen content may have gone well over 20%, and the algae (and cocoliths) mopped up most of the CO2 and methane, and as a result, the Earth went into a great freeze, Snowball Earth, which lasted most of the time up to the pre-cambrian.

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12y ago

The earth had liquid water H2O. When heated it terns to steam. Since tempature is the average of molecular movement, some fo the " water" is superheated. These molecules bonds are broken -breaking down to two hydrogen and one oxygen. Hope it helps Tyy

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11y ago

from stromatolites. they ate sunlight and pooped rocks and developed oxygen in our atmosphere

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11y ago

Biological activity

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Q: How did earths atmosphere become oxygen-rich?
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