the formation of metamorphic rock is a sequential process, with stages of rock being compacted, heated, recrystallized
gneiss is metamorphic_rock. geologic_process is physical_transformation. slate is metamorphic_rock. marble is metamorphic_rock. amphibolite is metamorphic_rock. metamorphic_rock is rock. metamorphic_rock is stone. igneous_rock is rock. marble is useful_metamorphic_rock. pillar is rock_formation.