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Biogeochemistry

Oxygenating the atmosphere

Photosynthesis is the main source of oxygen in Earth's atmosphere. But it may have been geological activity that first allowed an oxygen-rich atmosphere to develop.

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Figure 1: Events near the end of the Archaean, around 2,500 million years ago, which led from an oxygen-depleted to an oxygen-rich atmosphere.

References

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Correspondence to Norman H. Sleep.

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Sleep, N. Oxygenating the atmosphere. Nature 410, 317–318 (2001). https://doi.org/10.1038/35066664

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