metamorphism
change of minerals in rocks without melting into magma, occurring due to heat, pressure, and chemically active fluids
en-US/ˌmɛdəˈmɑɹfɪzəm/
en-GB/mɛtəmɔːfɪzəm/
change of minerals in rocks without melting into magma, occurring due to heat, pressure, and chemically active fluids