what is the density of the continental crust
The continental crust consists of various layers, with a bulk composition that is intermediate to felsic. The average density of continental crust is about 2.7 g / cm, less dense than the ultramafic material that makes up the mantle, which has a density of around 3.3 g / cm. Continental crust is also less dense than oceanic crust, whose density is about 2.9 g / cm. At 25 to 70 km, continental crust is considerably thicker than oceanic crust, which has an average thickness of around 7 -- 10 km. About 40% of Earth's surface is currently occupied by continental crust. It makes up about 70% of the volume of Earth's crust.