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aquifer a layer of rock, sand, or gravel that contains water from which wells and springs are supplied.
asphalt a mixture of this substance with gravel or sand, used to pave roads. [1/2 definitions]
bedrock the solid layer of rock in the earth's surface, found beneath soil, sand, or gravel.
concrete a hard, strong building material made by mixing sand, gravel, cement, and water. [1/3 definitions]
pan to wash gravel or sand in a pan to remove gold or other precious metals. [1/4 definitions]
quarry1 a large open hole or pit dug for mining stone, marble, gravel, or the like. [1/2 definitions]