Heat and pressure changed the volcanic rock and sedimentary debris into the metamorphic rocks that form part of the basement rock of our continent.
(Heat and pressure; changed; the volcanic rock and sedimentary debris; into the metamorphic rocks) (the metamorphic rocks; form; part of the basement rock of our continent)
Heat and pressure the metamorphic rocks
changed form
the volcanic rock and sedimentary debris into the metamorphic rocks
part of the basement rock of our continent