It arise from the transformation of existing rock to new types of rock, in a process called metamorphism
Metamorphic rocks are created when existing rock is transformed into new types of rock through a process known as metamorphism. Temperatures of 150 to 200 °C (300 to 400 °F) and, in some cases, pressures of 100 megapascals (1,000 bar) or more are applied to the original rock (protolith), generating significant physical and chemical changes. The rock remains mainly solid throughout this process, but progressively recrystallizes to a new texture or mineral composition. The protolith could be igneous, sedimentary, or metamorphic rock that already exists. Metamorphic rocks make up a substantial portion of the Earth's crust and account for 12% of the land surface. Their protolith, chemical and mineral constitution, and texture are used to classify them. They can be generated simply by being buried far beneath the Earth's surface, where they are exposed to tremendous temperatures and the immense pressure exerted by the rock strata above. Tectonic processes such as continental collisions, which create horizontal pressure, friction, and deformation, can also cause them to form.
How does a metamorphic rocks change into another type of metamorphic rock?
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