Earth
What is the opening that spews out lava called?
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What "flow" causes a buckling effect in the jet stream?
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What is the name for huge waves that are often caused by an underwater earthquake?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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What is the name of the limestone formation that rises from a cave floor?
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What famous volcano erupted in 1980 after many years of dormancy?
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What is it called when a plant produces two kinds of sex cells?
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