Earth
Groundhog Day predicts how long what will last?
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A line of equal or constant air temperature is what?
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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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What are ridges of rock debris caused by glacial action called?
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What type of energy sources can't be replaced readily within a 30-year span?
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