metamorphism

Noun
  1. Change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances (synset 113535851)
    is a type of: geologic process, geological process - (geology) a natural process whereby geological features are modified
    subtypes:
    • anamorphism - metamorphism that occurs deep under the earth's surface; changes simple minerals into complex minerals
    • epigenesis - a geological change in the mineral content of rock after the rock has formed
    • katamorphism - metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones

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