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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.
1 Oceanic crust is uniform in thickness and composition. 2  It is 5-6 km thick and is mafic in composition. 3  The differences in thickness and density between continental and oceanic are responsible for the existence of ocean basins due to isostatic balance as the crust floats on the more dense mantle. The crust: low density silicate rock, 5-70 km thick. 2  There are two distinct types of crust. 3  Continental crust is variable in thickness and composition. 4  Thickness ranges from 5-70 km.