Earth
What is the very bottom soil horizon called?
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What is the natural process by which rocks break down into smaller chunks?
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In the United States, in which month does spring begin?
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What mineral makes both sapphires and rubies when cut and polished?
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What are solids contained in the gas that issues from a volcano called?
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What type of energy sources can't be replaced readily within a 30-year span?
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The "Bergeron process" deals with what kind of precipitation?
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