How is a metamorphic rock formed and what processes are involved in its transformation?

Metamorphic rocks are formed when existing rocks are subjected to high heat, pressure, or chemical changes. This causes the minerals in the rock to rearrange and form new crystals, resulting in a new type of rock. The processes involved in the transformation of a rock into a metamorphic rock include heat and pressure from tectonic movements, as well as the presence of fluids that can alter the mineral composition of the rock.