What Metamorphic Rocks Are

Metamorphic rocks make up the third member in the family of rocks. These rocks are not formed from magma or sediments. However, in many ways, they are very similar to the first two members. Marble resembles limestone and slate looks a lot like shale. These resemblances are not coincidental. One is actually formed from the other through changes produced by natural forces. Metamorphic rocks are formed from existing rock when they undergo extreme heat, pressure and chemical changes over time. 

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