Answer:Like most components of Earth, rocks change over time in a cycle . Rocks exist in three forms (igneous, sedimentary , and metamorphic) and when exposed to extreme heat and pressure , they can cycle between these different forms. As rocks change from one form to another, their atoms are not destroyed; they just change . Also, no new minerals are created in the process; the amount of matter remains constant. Basically, materials in the rock cycle are [[recycled]] into new rock forms, similar to the way chemicals react in a closed system to create new substances.
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