sentences: sedimentary stone can be changed into metamorphic stone
docs: gneiss is metamorphic_rock. sedimentary_clay is soil. metamorphosis is changing_of_form. slate is metamorphic_rock. amphibolite is metamorphic_rock. metamorphic_rock is rock. marlite is metamorphic_rock. metamorphic_rock is stone. sedimentary_rock is stone. marble is useful_metamorphic_rock.