Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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Which of these might help keep erosion near a stream from happening?
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What do we call the dependable winds that rush toward the equator from the north and south?
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What is the imaginary line that runs from the North to the South Pole called?
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If an organic material is converted into stone, it becomes what?
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Whose calculation of the size of the earth's diameter was almost exact?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What is a meteoroid called if it lands on the Earth's surface?
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