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We know that the atmosphere became more oxygen rich around 1.8 ga because of geologic evidence such as:

We know that the atmosphere became more oxygen rich around 1.8 ga because of geologic evidence such as:
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We know that the atmosphere became more oxygen rich around 1.8 ga because of geologic evidence such as:

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User Amrabed
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The answer is: banded iron formations,
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User Puri
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