rock cycle
The recycling of the Earth's outer layers. Rocks are continually being formed, destroyed, and re-formed in an endless cycle of change that takes millions of years. The processes involved include the formation of igneous rock from magma (molten rock); surface weathering and erosion; the compaction and cementation of sediments into sedimentary rock; and metamorphism, chemical and physical changes brought about by heat and pressure, producing metamorphic rock.
© RM 2010. Helicon Publishing is division of RM.
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