Metamorphic rocks are formed by igneous or sedimentary rock which are then applied with pressure or heat or both.
(Metamorphic rocks; are formed; by igneous or sedimentary rock) (igneous or sedimentary rock; are applied; with pressure or heat or both; T:then)
Metamorphic rocks igneous or sedimentary rock
are formed are applied
by igneous or sedimentary rock
with pressure or heat or both T:then