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Questions and Answers
What gas made up the largest proportion of the Earth's atmosphere for the last 200 million years?
What gas made up the largest proportion of the Earth's atmosphere for the last 200 million years?
Which process primarily contributed to the increase of oxygen in the atmosphere around 2.7 billion years ago?
Which process primarily contributed to the increase of oxygen in the atmosphere around 2.7 billion years ago?
What was a significant characteristic of the Earth's early atmosphere according to prevailing theories?
What was a significant characteristic of the Earth's early atmosphere according to prevailing theories?
How did the percentage of carbon dioxide in the atmosphere decrease?
How did the percentage of carbon dioxide in the atmosphere decrease?
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Which gases are noted as being present in small proportions in the current atmosphere?
Which gases are noted as being present in small proportions in the current atmosphere?
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