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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.
Image via USGS. At the bottom of the oceans and some seas, there is oceanic crust. Oceanic crust is very thin (usually under 10 km), and is composed of dense, typically dark (mafic) rocks: basalt, gabbro, diabase. The continental crust is thicker than that â usually itâs around 40 km deep, but can go up to 70.