What are metamorphic rocks? American Geosciences Institute

Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming. In the very hot and pressured conditions deep inside the Earth’s crust, both sedimentary and igneous rocks can be changed into metamorphic rock. In certain conditions these rocks cool and crystallize usually into bands of crystals. Later they can become exposed on Earth’s surface. One way to tell if a rock sample is metamorphic is to see if the crystals within it are arranged in bands.

Metamorphic Rocks

How Are Metamorphic Rocks Formed? (Full Explanation)

Metamorphism - Wikipedia

Metamorphism - The Australian Museum

4.3: Metamorphic Rocks - Geosciences LibreTexts

Metamorphic rock, Definition, Formation, & Facts

What is chemical weathering? American Geosciences Institute

Reading: Characteristics of Metamorphic Rocks Geology (modification for Lehman College, CUNY)

Metamorphic Rocks : Metamorphism, Types, Minerals, Formaation