The continental crust is thicker than the oceanic crust. The average thickness of the continental crust is about 35 kilometers, while the average thickness of the oceanic crust is about 7 kilometers. The continental crust is thicker because it is made up of less dense rocks than the oceanic crust. The continental crust is made up of granite and other felsic rocks, while the oceanic crust is made up of basalt and other mafic rocks.