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BookmarkMetamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form".
The protolith is subjected to heat and extreme pressure causing profound physical and/or chemical change.
The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
Metamorphic rocks make up a large part of the Earth's crust..
For more information about the topic Metamorphic rock, read the full article at Wikipedia.org, or see the following related articles:
Sedimentary rock — Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition ... > read more
Feldspar mineral — Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both ... > read more
Igneous rock — Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive ... > read more
Crust (geology) — In geology, a crust is the outermost layer of a planet.
The crust of the Earth is composed of a great variety of igneous, metamorphic, and ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Metamorphic rock at Wikipedia.org. See the Wikipedia copyright page for more details.
