Earth
Approximately what fraction of the Earth's air is made up of oxygen?
More Questions from Earth
What is the system consisting of the Earth's sun and the eight planets orbiting it called?
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What did ancient farmers probably use to tell the passing of seasons?
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What organic material is formed from decaying organisms that mix with rocks?
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What is the tendency of Earth's rotation to turn winds called?
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What weather-related season is between June 1 and November 30 in North America?
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What term describes warm and excessively humid weather?
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