Metamorphic Rock
Gneiss
Heat
Quartzite
Slate
Marble
Soap Stone
Schist
Phyllite
Metamorphic rocks are formed by transformation of existing rocks into new rocks. The process is called as metamorphism. The original rock is exposed to 150° to 200° heat to convert the rock into new and more transformed rock. These rocks make large part of Earth's crust and they are almost 12% of Earth's surface.
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