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Metamorphic Rocks

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The Heat Is On

Metamorphic rocks are formed when sedimentary or igneous rocks change under pressure or heat.
NASA

Earth is a huge mass made up of three kinds of rocks, called metamorphic rocks, igneous rocks, and sedimentary rocks. Can one kind of rock change into another? The answer is yes!

Metamorphic rocks form when heat and pressure produce changes in igneous rocks, sedimentary rocks, or other metamorphic rocks. For example, the metamorphic rock slate was once a sedimentary rock called shale. Metamorphic rocks generally form deep under ground. This is because the deeper a rock is buried underground, the more heat and pressure there is on it. Heat and pressure change the properties of existing rocks and turn them into metamorphic rocks.

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"Metamorphic Rocks." PowerKnowledge Earth & Space Science, The Rosen Publishing Group, Inc. Web. 19 November 2017.

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Metamorphic Rocks. (n.d.). Retrieved November 19, 2017, from http://www.pkearthandspace.com/article/570/metamorphic-rocks

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"Metamorphic Rocks." PowerKnowledge Earth & Space Science, The Rosen Publishing Group, Inc. Accessed November 19, 2017. http://www.pkearthandspace.com/article/570/metamorphic-rocks.