Earth

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

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What must happen for a tree to become a fossil?
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How much salt is in every gallon of seawater?
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What are mounds of sand that have been windblown called?
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Which is NOT a type of drainage pattern?
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78% of the earth's atmosphere is composed of which gas?
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What is a Herkimer diamond?
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Which of these is not a type of a major oil trap?
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What is the name of a representation of the Earth on a piece of paper?
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