Which of the following is NOT a typical environment in which a metamorphic rock might form?

A.

squeezing by tectonic forces

B.

heating adjacent to underground magma

C.

burial to great depths

D.

explosive eruption of volcanic ash



Answer :

A local intrusive heat source impact metamorphism.The temperature rises with increasing depth of burial due to an increased rate of radioactive decay.

Rocks form on Earth as igneous,sedimentary,or metamorphic rocks. Igneous rocks are formed when rocks are heated to the melting point that forms magma.Metamorphic rocks form when rocks are subjected to high temperatures, high pressure, hot mineral-rich fluids,or more commonly, some combination of these factors. crust and is heated by the geothermal gradient.At temperatures above 200˚C,some of the existing minerals can become unstable.Metamorphic rocks form when rocks are subjected to high temperatures,high pressure,hot mineral-rich fluids,or more commonly, some combination of these factors.Conditions like these are found deep within the Earth or on tectonic plates.

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