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Why are scientists able to learn about the ancient atmosphere by studying the rocks that came into contact with the ancient atmosphere?

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Indeed this if crab
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User Mloureiro
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Answer: This is because the layers of these rocks were laid down at a very important period in the history of Earth's atmosphere. They formed at the same time that oxygen gas began to accumulate, or build up, in the atmosphere. So scientists study these rocks in order to learn about that time period.

Step-by-step explanation:

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User Poovaraj
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