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5 Cards in this Set
- Front
- Back
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Poor quality coal that could not be used at the time it was mined.
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waste coal
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Rocks formed by increases in heat and pressure.
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metamorphic rocks
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Rocks formed from molten material.
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igneous rocks
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Rocks formed from sediments pressed or cemented together.
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sedimentary rocks
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Igneous rocks formed above Earth's surface.
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extrusive
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