How are metamorphic rocks formed?
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Metamorphic rocks are created by the physical or chemical alteration by heat and pressure of an existing igneous or sedimentary material into a denser form. Due to the action of plate tectonics, compression, stress and shearing forces over long periods of time, rocks can be essentially warped and deformed, causing them to be compacted into a smaller volume of space.
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Formation of metamorphic rocks
Metamorphic rocks are created by the physical or chemical alteration by heat and pressure of an existing igneous or sedimentary material into a denser form. In some cases, heat from the Earth's interior can melt the rock slightly, in a process termed "contact metamorphism."
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