Earth

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

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What type of rock is coal?
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A "gustnado" is a gust from what?
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What is the federal weather agency in Canada called?
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What is the largest natural carbon sink on earth?
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Where is most of the earth's gold located?
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Which is not a sedimentary rock?
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What piece of material attracts iron and some other metals?
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