Discussion
The metamorphism which involves the chemical replacement of elements in rock minerals when gases and liquids permute into bedrock is called
Answer: A
Metasomatic metamorphism is the change in a rock's chemistry brought about when hot gases and fluids permeate the bedrock and exchange ions with the existing minerals, replacing some elements with others.
The other kinds are distinguished by their agent rather than by chemical exchange: thermal and contact metamorphism act mainly through heat from an intrusion, and dynamic metamorphism through directed pressure along fault zones.
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