Earth
What was the Great Plains of the U.S. called in the 1930's because of erosion?
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What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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What is an underwater boat with its own power and air supply called?
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About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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What clouds have bases between 6,000 and 18,000 feet?
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