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en.wikipedia.org/wiki/Metamorphic_rock

Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock ...

geology.com/rocks/metamorphic-rocks.shtml

Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure. It is composed ...

www.onegeology.org/extra/kids/metamorphic.html

Metamorphic rocks are made by either heating up or squashing the earth's crust. They are often found in mountainous regions. One example is slate. Slate was ...

www.mineralogy4kids.org/rock-cycle/metamorphic-rocks

Any rock (igneous, sedimentary, or metamorphic) can become a metamorphic rock. If rocks are buried deep in the Earth at high temperatures and pressures, ...

www.usgs.gov/faqs/what-are-metamorphic-rocks-0

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic ...

www.rocksandminerals4u.com/metamorphic.html

The table below shows examples of common metamorphic rocks. Clicking on the name of the rock will bring up a larger picture and a description of the rock type ...

www.sciencekids.co.nz/sciencefacts/earth/metamorphicrocks.html

Find interesting information and a range of examples that help explain what metamorphic rocks are and what makes them different from other kinds of rocks.

earth.rice.edu/mtpe/geo/geosphere/topics/rocks/30_rocks_metamorphic1.html

Metamorphic rocks are created by the physical or chemical alteration by heat and pressure of an existing igneous or sedimentary material into a denser form.

www.thoughtco.com/about-metamorphic-rocks-1438952

Oct 4, 2017 ... Metamorphic rocks are the third great class of rocks. They occur when sedimentary and igneous rocks become changed, or metamorphosed, ...