How do we know that the atmosphere of the earth experienced an increase in O₂ and became oxidizing between 2.5 and 2 billion years ago?

Name: How do we know that the atmosphere of the earth experienced an increase in O 2 and became oxidizing between 2.5 and 2 billion years ago?
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The Answer of How do we know that the atmosphere of the earth experienced an increase in O₂ and became oxidizing between 2.5 and 2 billion years ago?

How Do We Know That the Atmosphere of the Earth