from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A type of metamorphism in which the mineralogy and texture of rocks are changed over a wide area by deep burial and heating associated with the large-scale forces of plate tectonics.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology Widespread change in
rockdue to high pressureand temperaturethroughout an area
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