Earth
What is the name of the limestone formation that rises from a cave floor?
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What process helps to break down rocks by wind, air or rain?
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What weather-related term comes from Greek words for "high in the sky" and "knowledge"?
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What is the system consisting of the Earth's sun and the eight planets orbiting it called?
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What produces more energy than all the world's nuclear weapons combined?
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What mineral makes both sapphires and rubies when cut and polished?
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