How do we know that atmospheric concentrations of oxygen have increased over the past 3.5 billion years
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How do we know that atmospheric concentrations of oxygen have increased over the past 3.5 billion years

[From: ] [author: ] [Date: 12-06-21] [Hit: ]
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and what techniques and such can be used to establish this?
thanks very much!

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One good tip-off is the composition of sedimentary rocks over time. Banded Iron Formations are a particularly interesting clue.
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