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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.
Oceanic crust, the outermost layer of Earthâs lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges, which occur at divergent plate boundaries. 1  Oceanic crust is about 6 km (4 miles) thick. 2  The lavas are generally of two types: pillow lavas and sheet flows.