Earth
What was the name of the volcano that used to be Crater Lake?
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What piece of material attracts iron and some other metals?
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What is the theory that describes how the continents got where they are today?
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What produces more energy than all the world's nuclear weapons combined?
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What is the name for snow crystals that melt and refreeze into granular particles on glaciers?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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