How do metamorphic rocks form?
Metamorphic rocks are formed when other types of rocks (like igneous rocks and sedimentary rocks) go through physical and chemical changes. The rock that the metamorphic rock started out as is called a parent rock.
Metamorphic rocks are buried deep in the earth's surface and under a LOT of pressure. The main causes for the rock’s morphing are: pressure, heat, and fluids that chemically react with the rock. When metamorphic rocks are changing, they have to stay in a solid or semi-solid state. If they completely melt they will turn into igneous rocks!
The physical and chemical changes make two distinct types of metamorphic rocks: foliated and non-foliated. Foliated metamorphic rocks have been exposed to heat and direct pressure and are made out of more than one mineral. They have a banded or striped look to them. Non-foliated metamorphic rocks are made out of one type of mineral and do not have different layers or stripes.
Metamorphic rock examples and uses
Click to see examples of metamorphic rocks and examples of how they are used on a PowerPoint slide show. Then return to this site to take the quiz below and continue learning about rocks!
Quiz time - assessing what you've learned
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