Metamorphic rocks consist of pre-existing (igneous, metamorphic, or sedimentary) rocks that underwent a change because of high temperatures and usually, pressure.
(Metamorphic rocks; consist; of pre-existing (igneous, metamorphic, or sedimentary) rocks) (igneous, metamorphic, or sedimentary) rocks; underwent; a change; because of high temperatures and usually, pressure)
Metamorphic rocks igneous, metamorphic, or sedimentary) rocks
consist underwent
of pre-existing (igneous, metamorphic, or sedimentary) rocks
a change because of high temperatures and usually, pressure