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Oceanic crust also has a density of about 3.0 grams per cubic centimeter. The continent's are composed of mainly granitic rock whose thickness varies between 10 and 70 kilometers. The thickest portions of continental crust are found under the various mountain ranges.
Continental crust is also less dense than oceanic crust, whose density is about 2.9 g/cm 3. At 25 to 70 km, continental crust is considerably thicker than oceanic crust, which has an average thickness of around 7â10 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.