Earth
Which scale is used to describe a mineral's hardness?
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What product of burning fossil fuels can cause death by preventing oxygen from getting to cells?
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In the United States, in which month does spring begin?
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What is the name of the limestone formation that rises from a cave floor?
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What is the natural process by which rocks break down into smaller chunks?
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What "foggiest" world capital averages 47 fogs a year?
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