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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 has an average composition similar to this granite, a piece of a kitchen counter top (â). Continental crust, the thin, light-gray layer on the figure to the right, averages 35 to 40 km (20 to 25 mi) in thickness. Continental Crust Oceanic Crust Mantle.