(3) metamorphic These are sedimentary or igneous rocks that have been altered by heat or pressure.
(These; are; sedimentary or igneous rocks that have been altered by heat or pressure) (sedimentary or igneous rocks; have been altered; by heat or pressure)
These sedimentary or igneous rocks
are have been altered
sedimentary or igneous rocks that have been altered by heat or pressure
by heat or pressure