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metamorphic
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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 (protolith) is subjected to heat and pressure, (temperatures greater than 150 to 200 °C and pressures of 1500 bars) causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
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metamorphic
| Dizionario inglese-italiano 1.0.012 | Download this dictionary |
METAMORPHIC
METAMORFICO
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metamorphic
| hEnglish - advanced version | Download this dictionary |
metamorphic
metamorphic
\met`a*mor"phic\ (?), a. [see metamorphosis.]
1. subject to change; changeable; variable.
2. causing a change of structure.
3. (geol.) pertaining to, produced by, or exhibiting, certain changes which minerals or rocks may have undergone since their original deposition; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.
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