Discussion
Metamorphic rocks are formed by the alteration of existing rock by heat, pressure and
Answer: D
Correct answer: chemically active fluids
The three agents of metamorphism are heat, pressure and chemically active fluids, the last carrying material into and out of the rock and greatly accelerating recrystallisation. Weathering acts at the surface and is not metamorphism, and melting would take the rock out of the metamorphic realm altogether - metamorphism proceeds in the solid state, which is its defining constraint.
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