How does magma change into metamorphic rocks
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Granite is an igneous rock that forms when magma cools relatively slowly underground. It is usually composed primarily of the minerals quartz, feldspar, and mica. When granite is subjected to intense heat and pressure, it changes into a metamorphic rock called gneiss.
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Metamorphic rocks are formed from older igneous or sedimentary rocks when they are subjected to increased temperature, pressure and shearing stress or chemically active fluid at considerable depth in earth’s crust. Recrystallization occurs and new minerals and new textures are produced.
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