Which of the physical processes below results in the formation of metamorphic rocks?
a. weathering and erosion
b. cooling and crystallization
c. heat and pressure
d. deposition and eruption

c. heat and pressure

Explanation:

Metamorphic rocks are formed exertion of external heat and pressure over the existing sedimentary and igneous rocks. Certain geological activities such as underground compression, stress, plate tectonics, exertion of shearing force causes deformation of the existing rocks. The metamorphic rocks formed are generally more denser than the previously existing parent rocks.

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