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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.
Continental crust is also less dense than oceanic crust, whose density is about 2.9 g/cm 3. Continental crust is considerably thicker than oceanic crust, mostly 25 to 70 km versus the average thickness of the oceanic crust of around 7â10 km.About 40% of Earth's surface is now overlaid by continental crust.his line is called the Conrad discontinuity .). Consisting mostly of granitic rock, continental crust has a density of about 2.7 g/cm 3 and is less dense than the material of Earth's mantle, which consists of ultramafic rock and whose density is about 3.3 g/cm 3.