Earth

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

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What produces more energy than all the world's nuclear weapons combined?
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Which of these terms can be used to describe steam?
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Which of these types of pollution occurs naturally?
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What molecules in fossil fuels are made from carbon and hydrogen?
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What does a pluviometer measure?
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Sudden flooding caused by heavy rain is called what?
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What does granite become when put under heat and pressure?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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