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Geological history of oxygen

earth science Maturity 9-11

Long ago, Earth had no air to breathe.

Oxygenation-atm-2.svg
Oxygenation-atm-2.svg
Then, tiny living things made the air. This air helped more life grow. Now, we breathe this air every day. It helps us stay alive. Do you like to breathe deep?

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File:Oxygenation-atm-2.svg
Oxygenation-atm-2.svg
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