Earth
What is compressed moss that turns blackish brown called?
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Broken river ice stuck in a narrow channel causes what?
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What did ancient farmers probably use to tell the passing of seasons?
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What type of speleothems found in limestone caves grow upward from the floor?
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Which of these is the best way meteorologists track big storms such as hurricanes?
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What type of energy sources can't be replaced readily within a 30-year span?
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