Earth

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

More Questions from Earth
Alaska and what state have record highs of 100 degrees?
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Weather radar that measures direction and speed of a moving object best fits which science term?
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What cloud has a flat, sheetlike appearance?
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Which of these types of pollution occurs naturally?
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Which is the largest planet in Earth's solar system?
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What type of gem is the Star of Africa or the Cullinar II?
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Every second, 100,000 cubic feet of water pours over what?
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What kind of waves does an earthquake produce?
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