Which agents are necessary in the formation of metamorphic rocks? check all that apply. a. erosion b. heat c. lava d. pressure e. sediments

Metamorphic rocks are formed by the physical or chemical changes that occur in the existing igneous or sedimentary material. These are formed by process such as compression, shearing and stress forces, plate tectonics. These are formed by the erosional breakdown of the pre- existing rocks or because of the subduction of the sedimentary rocks under another plate or heat melting the rocks present in the earth's interior.

Therefore, agents which are necessary in the formation of metamorphic rocks are A. erosion, B.heat,  D.pressure and E. sediments.

Metamorphic rocks are formed as a result of heat and pressure.

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