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Which of these types of energy is cleanest and causes the least pollution?
Earth
Which of these types of energy is cleanest and causes the least pollution?
Gasoline
Natural Gas
Coal
Wind
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Which of these continents would you find in the southern, western hemisphere?
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What word means "the shakes that come after the earthquakes"?
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Snow particles that have blown into a pile are said to form what?
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Which word means to "filter down through the soil horizons"?
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Where is the type location for the Permian Period?
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In which U.S. state was the prehistoric proglacial lake Glacial Lake Missoula located?
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Which of these is not a category of groundwater?
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What substance, added to fog, makes smog?
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