Earth
What periods of the Earth's history had glaciers covering a lot of the Earth?
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What "flow" causes a buckling effect in the jet stream?
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What is an underwater boat with its own power and air supply called?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What is water that flows over the ground rather than seeping into it called?
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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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In weather terms, what turns to water in a "spring thaw"?
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