Earth
What is the most common element in Earth's atmosphere?
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78% of the earth's atmosphere is composed of which gas?
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What is the name for the semiarid region that surrounds most deserts?
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What is the name of any body of igneous rock named for the Roman god of the underworld?
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What was the most common type of rock to be found during the Precambrian Period?
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What front results when a cold front takes the area of a warm front?
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What type of boundary is displayed at the Mid-Atlantic Ridge?
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