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Billions of years ago, the Earth's atmosphere was composed primarily of carbon dioxide. Where might ...

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Billions of years ago, the Earth's atmosphere was composed primarily of carbon dioxide. Where might ...

Billions of years ago, the Earth's atmosphere was composed primarily of carbon dioxide. Where might you go on the Earth to find a large fraction of this carbon dioxide today?
A)   Nowhere—most of the carbon dioxide has escaped into space
B)   Anywhere—most of the carbon dioxide is still in the atmosphere, but nitrogen and oxygen have since been added to it
C)   To extinct volcanoes, which are composed of rock from the Earth's interior that absorbed the carbon dioxide earlier in the Earth's history
D)   To mountain ranges such as the Rocky Mountains of North America, which are composed largely of limestone

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Discovering the Universe

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

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