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.

Metamorphism - The Australian Museum

New York Rock Exchange: Understanding the Geological Variations of Central Park - The Observer

Metamorphic rock

Metamorphic rocks - The Australian Museum

Basement Geology of Idaho

Rock: Mineral information, data and localities.

Unit 5 Reading: Igneous & Metamorphic Processes

What is chemical weathering? American Geosciences Institute

Metamorphic Rocks : Metamorphism, Types, Minerals, Formaation

Metamorphic rock, Definition, Formation, & Facts

The Rock Cycle

Slate: Mineral information, data and localities.

8 Metamorphic Minerals and Metamorphic Rocks – Mineralogy

Metamorphic rock - Wikipedia

Metamorphic rock, Definition, Formation, & Facts