The rock cycle describes the transitions among the three main rocks: sedimentary, metamorphic, and igneous. The main idea is that rocks are continually changing from one type to another and back again. Forces inside the earth bring them closer to the surface where they are weathered, eroded, and compacted, and forces on the earth sink them back down where they are heated, pressed, and melted. So the elements that make up rocks are never created or destroyed instead, they are constantly being recycled.
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