Earth
What igneous formation is usually seen in the core of folded mountains?
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What is the highest mountain, considering just the contiguous United States?
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What kind of gas is central in terms of the effect global warming?
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What organic material is formed from decaying organisms that mix with rocks?
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What type of energy sources can't be replaced readily within a 30-year span?
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What were water mills used for in the 1700's in Europe?
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What clouds have bases between 6,000 and 18,000 feet?
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