The formation of two different rocks is described below. rocks deeply buried in earth's crust are subjected to intense heat and pressure to form rock a. on the surface of earth, fragments of rocks, shells, and minerals are cemented together to form rock b. which statement is correct? both rock a and rock b are metamorphic rocks. both rock a and rock b are sedimentary rocks. rock a is a metamorphic rock and rock b is a sedimentary rock. rock a is a sedimentary rock and rock b is a metamorphic rock.