Answer: The new rock that forms when existing rock is heated or squeezed is called a metamorphic rock. Metamorphic rocks are formed from pre-existing rocks (either igneous, sedimentary or other metamorphic rocks) that have been subjected to intense heat and/or pressure, which causes them to undergo physical and/or chemical changes. The heat and pressure cause the minerals in the rock to recrystallize, creating a new rock with a different texture and sometimes new minerals. Examples of metamorphic rocks include marble, slate, and gneiss.
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