Final answer:
Heat, pressure, and tectonic stress are factors that change igneous and sedimentary rocks into metamorphic rocks.
Explanation:
Heat, pressure, and tectonic stress are factors that contribute to changing igneous and sedimentary rocks into metamorphic rocks. Metamorphic rocks form due to the physical and chemical alteration of pre-existing rocks under conditions of heat and pressure, leading to the recrystallization of minerals and the formation of new minerals.
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