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The crust is composed of two basic rock types granite and basalt. The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt.Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates.arth's rocky surface is divided into two types: oceanic crust, with a thin dense crust about 10 km thick, and continental crust, with a thick light crust about 40 km thick.
â¢ Oceanic crust is mainly basalt whereas continental crust is mainly granite. â¢ Oceanic crust is relatively younger than continental crust. â¢ Continental crust is made up of landmasses, whereas oceanic crust is the floor of the oceans.â¢ Continental crust is thicker (25-70 km) than oceanic crust (7-10 km) and is nearly 35-40km deep. Related posts:ceanic Crust. As the name implies, oceanic crust is the floor of the oceans. Obviously, this crust is thinner than the continental crust. The major type of rocks making up oceanic crust is basalt.