Metamorphic rocks – Types and Characteristics Introduction: Metamorphic rocks are formed by the transformation of pre-existing rocks (igneous, sedimentary) to a new type of rock and then followed by the process called metamorphism. The pre-existing rock is subjected to high temperatures (greater than 150 to 200 °C), and high pressure, which causes physical and chemical changes in the earth’s crust. Example of metamorphic rocks is- Gneiss, marble, slate, schist, etc. Metamorphic rocks make up a large part of Earth’s crust and form 12% of the Earth’s land surface. The Process…
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