Igneous rocks
Sedimentary rocks
Metamorphic rocks
Acid rocks
The rocks that form from pre-existing rocks that were subjected to high temperature or pressure are called metamorphic rocks.
- Metamorphic rocks, meta- meaning change and –morphos meaning form, is one of the three rock categories in the rock cycle. Metamorphic rocks are created when heat, pressure, and/or fluids change preexisting rocks. The rock cycle shows that both igneous and sedimentary rocks can become metamorphic rocks. And metamorphic rocks themselves can be re-metamorphosed. Because metamorphism is caused by plate tectonic processes, metamorphic rocks provide geologists with a history book of how past tectonism shaped our planet.
Also check: Sedimentary rocks are? (CSS 2009 General Science & Ability Paper)
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