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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.
Accordingly, the crust is divided into two types; the continental crust and the oceanic crust. Oceanic Crust. The oceanic crust is that part of the Earthâs crust that covers the ocean basins. It consists of dark-colored rocks made up of basalt.This rock is made up of silicon, oxygen, and magnesium.The density of the oceanic crust is about 3.0 g/cm3.The continental crust has a lower density. This difference in the average densities allows many natural phenomenon to occur on and below the surface of the Earth. The oceanic crust scarcely floats on the mantle.t consists of dark-colored rocks made up of basalt. This rock is made up of silicon, oxygen, and magnesium. The density of the oceanic crust is about 3.0 g/cm3. The continental crust has a lower density.