When igneous and sedimentary rocks have a lot of pressure and heat, they are changed to metamorphic rocks.
(igneous and sedimentary rocks; have; a lot of pressure and heat) (they; are changed; to metamorphic rocks; T:When igneous and sedimentary rocks have a lot of pressure and heat)
igneous and sedimentary rocks they
have are changed
a lot of pressure and heat
to metamorphic rocks T:When igneous and sedimentary rocks have a lot of pressure and heat