Earth
What is a comparison of air water vapor to amounts of vapor at a given temperature called?
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What is the name of the limestone formation that rises from a cave floor?
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How many days a year is the sun invisible at the North Pole?
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What weather-related term comes from Greek words for "high in the sky" and "knowledge"?
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What can help farmers control erosion in their fields?
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What is the hard, dark substance found in the ground that is mined for fuel?
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What kind of scientist would study rocks, minerals and mountains?
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