Definition of metamorphic rock Metamorphic rock
We found 3 definitions of metamorphic rock from 3 different sources.
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What does metamorphic rock mean?
WordNet
Noun |
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| metamorphic rock - rock altered by pressure and heat | ||
| rock, stone pitching dangerously to one side | ||
| amphibolite a metamorphic rock composed chiefly of amphibole and plagioclase | ||
| marlite, marlstone metamorphic rock with approximately the same composition as marl | ||
| hornfels, hornstone a fine-grained metamorphic rock formed by the action of heat on clay rocks | ||
| gneiss a laminated metamorphic rock similar to granite | ||
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Wiktionary 
- metamorphic rock (Noun)
One of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface.
Wikipedia 
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A metamorphic rock is a type of rock that is formed when its pre-existing rock is changed. It's name is derived from the the word "morph", meaning change.
That will happen if different temperature and pressure conditions than those in which the original rock was formed occur. These temperatures and pressures are always higher than those at the Earth's surface and must be sufficiently high that they change the original minerals into other mineral types or into other forms of the same minerals (e.g. by recrystallisation) under the pressure of Earth's crust over long periods of time.
Marble is a type of metamorphic rock.
