Earth

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

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In which U.S. state was the prehistoric proglacial lake Glacial Lake Missoula located?
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What is sedimentary rock composed primarily of sand-sized grains?
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Which scale is used to describe a mineral's hardness?
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What is the name for the semiarid region that surrounds most deserts?
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What is the term used to classify igneous rocks that are light in both color and gravity?
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What was the most common type of rock to be found during the Precambrian Period?
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