Metamorphism



[met-uh-mawr-fiz-uh m] /ˌmɛt əˈmɔr fɪz əm/

noun
1.
Geology. a change in the structure or constitution of a rock due to natural agencies, as pressure and heat, especially when the rock becomes harder and more completely crystalline.
2.
Archaic. .
/ˌmɛtəˈmɔːfɪzəm/
noun
1.
the process by which metamorphic rocks are formed
2.
a variant of metamorphosis
n.

1837, from metamorphic + -ism.
metamorphism
(mět’ə-môr’fĭz’əm)
The process by which rocks are changed in composition, texture, or structure by extreme heat and pressure. ◇ In prograde metamorphism metamorphic rocks that were formed under low pressure and temperature conditions undergo a second metamorphic event in which they are exposed to higher pressures and temperatures. ◇ In retrograde metamorphism metamorphic rocks that were formed under high pressure and temperature conditions undergo a second metamorphic event in which they are exposed to lower pressures and temperatures. See more at contact metamorphism, regional metamorphism.

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