Earth
What was the name of the volcano that used to be Crater Lake?
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What is the imaginary line that runs from the North to the South Pole called?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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What is the name of the limestone formation that rises from a cave floor?
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What is the estimate of the true age of a mineral or rock called?
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Which of the following is not a major component of an ecosystem?
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