Why Earth's oxygen rose and then fell during the Lomagundi event

Earth's oxygen once rose and then fell again

Around 2.3 billion years ago, oxygen in the atmosphere may have risen to roughly modern levels during an event called Lomagundi–Jatuli. By about 2.1 billion years ago, it had fallen again. Earth's oxygen did not simply rise in one steady climb toward today's level.

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Why Earth's oxygen rose and then fell during the Lomagundi event

Earth's oxygen once rose and then fell again

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