Earth
What mineral makes both sapphires and rubies when cut and polished?
More Questions from Earth
What is water that flows over the ground rather than seeping into it called?
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What type of speleothems found in limestone caves grow upward from the floor?
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About 100 lightning bolts strike the earth how often?
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What destructive event can happen when it rains for a long period of time?
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What is the imaginary line that runs from the North to the South Pole called?
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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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