Which term describes the continuous cycle of processes that transform rocks from one type to another?

• A. Deposition
• B. Weathering
• C. Rock cycle
• D. Metamorphism

Answer: (C)

The rock cycle describes how rocks continually change from one type to another through interrelated processes. It shows how igneous rocks form when molten material cools and crystallizes; how sedimentary rocks form when fragments are deposited, buried, compacted, and cemented; and how metamorphic rocks form when existing rocks are subjected to heat and pressure. Because rocks can melt to form magma and then begin the cycle again, this is a continuous loop. That makes it the best term for describing the ongoing transformation of rock types.

Deposition is the laying down of sediment, weathering is the breakdown of rocks at or near the surface, and metamorphism is one way rocks are altered by heat and pressure—each is part of the cycle, but not the whole idea.