exposure to extreme heat and pressure changes igneous rock into metamorphic rock
metamorphic_rock is rock. metamorphic_rock is not stone. amphibolite is not metamorphic_rock. igneous_rock is rock. slate is metamorphic_rock. marble is metamorphic_rock. metamorphic_rock is not rock. metamorphic_rock is stone. amphibolite is metamorphic_rock. slate is not metamorphic_rock.