Has The Atmosphere Always Been The Same Short Answer

Has The Atmosphere Always Been The Same? – Short Answer

When earth first formed some 4,500 million years ago, the atmosphere was mainly made up of hydrogen and carbon dioxide. Most of the hydrogen, being light, then spread out into space and the carbon dioxide became locked up in rocks. Oxygen was not a component of the atmosphere till about 2,000 million years ago, when plants evolved.

Has The Atmosphere Always Been The Same Short Answer

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