why is internal heat responsible for rocks



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    Rocks are formed under various circumstances that include pressure, heat and chemical change. The Earth’s internal heat contributes to making some rocks, but most of those at the surface are sedimentary, not requiring heat. Igneous rocks do require heat, and occur, for example, when sedimentary rocks are remelted at subduction zones.

    In planets and moons with little atmosphere such as our own Moon and Mercury, most change in the last millions of years came from the heat and pressure generated by asteroids in the few moments after they slammed into the surfaces at terrific speed.

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