Continental crust is also less dense than oceanic crust ( density of about 2.9 g\/cm3 ) , though it is considerably thicker ; mostly 25 to 70 km versus the average oceanic thickness of around 7-10 km .
Continental crust is also less dense than oceanic crust , though it is considerably thicker ; mostly 35 to 40 km versus the average oceanic thickness of around 7-10 km .