Metamorphic rocks are one the three main rock groups(the other two being igneous and sedimentary).


They are the result of a transformation of an already existing type of rock, through a process called metamorphism. Before metamorphism, the rock is subjected to great heat and pressure. They can be formed deep beneath the Earth's surface, from the pressure built up due to the rock layers above.

Types of Metamorphic RockEdit

Common examples of metamorphic rock are slate and marble.

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