Earth

What is the hard, dark substance found in the ground that is mined for fuel?

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What term describes the overflowing of rivers or streams?
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A "gustnado" is a gust from what?
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What is another name for green beryl?
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What is the repeating cycle of precipitation, condensation and evaporation called?
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What is an underwater boat with its own power and air supply called?
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Who issues severe weather advisories in the U.S.?
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Which of these is a warm spell of weather when ice and snow melt?
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What is the top layer of the soil called?
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