Earth
What is the test that can help determine the hardness of a rock called?
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What type of gem is the Star of Africa or the Cullinar II?
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What is the name of the limestone formation that rises from a cave floor?
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Which of these is the best way meteorologists track big storms such as hurricanes?
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If the beach loses 3 feet of sand each year, how many feet will it lose in 15 years?
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What kind of calendar traditionally predicts the weather?
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