Rocks which are formed when heat and pressure are added to igneous or sedimentary rocks 9.
(Rocks; are formed; T:when heat and pressure are added to igneous or sedimentary rocks) (heat and pressure; are added; to igneous or sedimentary rocks)
Rocks heat and pressure
are formed are added
T:when heat and pressure are added to igneous or sedimentary rocks
to igneous or sedimentary rocks