Earth

Approximately what fraction of the Earth's air is made up of oxygen?

More Questions from Earth
What are minerals found in high quantities and worth mining called?
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What word means "the shakes that come after the earthquakes"?
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Which is the parent rock of marble?
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What disaster is a combo of downdrafts and updrafts?
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What kind of rain is bad for the environment?
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What famed rock is 1396 feet high, 2.75 miles long, and .25 miles wide?
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What is the opening that spews out lava called?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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