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Geography 18 Online
OpenStudy (anonymous):

sedimentary rock to metamorphic rock process

OpenStudy (ryjhbl):

Metamorphic rocks are the third great class of rocks. These are what happens when sedimentary and igneous rocks become changed, or metamorphosed ("changed in form"), by conditions underground. The four main agents that metamorphose rocks are heat, pressure, fluids and strain. These agents can act and interact in an infinite variety of ways. for more reading http://geology.about.com/cs/basics_roxmin/a/aa011804c.htm

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