Metamorphic rocks: Sometimes sedimentary and igneous rocks are subject to pressures so intense or heat so high that they are completely changed.
(Metamorphic rocks: Sometimes sedimentary and igneous; are; subject to pressures so intense or heat so high that they are completely changed) (they; are changed; ) (sedimentary and igneous rocks; are subject to; pressures)
Metamorphic rocks: Sometimes sedimentary and igneous they sedimentary and igneous rocks
are are changed are subject to
subject to pressures so intense or heat so high that they are completely changed
pressures