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Known as the Great Oxygenation Event, Earth froze over as oxygen accumulated in our atmosphere, nearly driving all life extinct.

Czech republicUnited statesKristian petersFabelfroh wikimedia commonsKevinm gill flickrNikki watsonAshley cooperLuke thompsonYeast colony groupChisholm labCharles universityGreat oxidation eventGreat oxygenationSnowball earthMogana das murteyPatchamuthu ramasamy