metamorphic rocks
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Created by:
mackenziekingston on November 2, 2011
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8 terms
Terms | Definitions |
|---|---|
 metamorphic rock | form when existing rocks undergo change through heat and pressure |
| where does this change occur | deep below the Earths surface |
| contact metamorphism | forms when magma intrudes into existing rock but these are minor |
| regional metamorphism | formed during mountain building process that occur over a large area and these changes are major |
| heat | causes existing minerals to recrystallize or new minerals to form |
| pressure | causes the spaces between mineral grains to close = more compact = rocks greater density |
| foliated metamorphic rocks | form when minerals recrystallize at right angles to the direction or force, causes a layered or banded appearance |
| nonfoliated metamorphic rocks | no banded texture, most contain only one mineral |
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