Either igneous or sedimentary rock is metamorphosed, or changed, usually through extreme heat or pressure under the earth's crust.
(Either igneous or sedimentary rock; is metamorphosed; ) (Either igneous or sedimentary rock; changed; L:under the earth's crust)
Either igneous or sedimentary rock Either igneous or sedimentary rock
is metamorphosed changed
L:under the earth's crust