what makes the surface of the earth
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Most of the Earth surface, about 70%, is covered with water. Underneath the water that fills the oceans, and the dirt and plants that cover the continents, the Earth's surface layer is made of rock. ... This outer layer formed a hard, rocky crust as lava cooled about 4.5 billion years ago.
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The U.S. mining industry consists of the search for, extraction, beneficiation, and processing of naturally occurring solid minerals from the earth. These mined minerals include coal, metals such as iron, copper, or zinc, and industrial minerals such as potash, limestone, and other crushed rocks.
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