exposure to extreme heat and pressure changes igneous rock into metamorphic rock
gneiss is metamorphic_rock. andesite is igneous_rock. slate is metamorphic_rock. marble is metamorphic_rock. amphibolite is metamorphic_rock. metamorphic_rock is rock. metamorphic_rock is stone. marlite is metamorphic_rock. marble is useful_metamorphic_rock. igneous_rock is rock.