Earth
What was the name of the volcano that used to be Crater Lake?
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What is the estimate of the true age of a mineral or rock called?
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What is petroleum as found in the earth, before it is refined?
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Although beaches can be comprised of any particle, the majority of them consist of what?
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What evidence tells scientists that some dinosaurs may have lived together in groups?
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What name is used specifically to describe the region around the South Pole?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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