Earth
What molecules in fossil fuels are made from carbon and hydrogen?
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What is an underwater boat with its own power and air supply called?
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What type of scientist studies microscopic plants and animals?
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Advection, freezing and radiation are types of what weather phenomenon?
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In which U.S. state was the prehistoric proglacial lake Glacial Lake Missoula located?
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Which object is a remnant of a lightning bolt striking a sandy beach?
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