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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.
These continents include, Africa, Europe/Asia, North America, South America, Antarctica, and Australia. The Earths thickness beneath these continents range from 20-25 miles, and has a maximum thickness of 45 miles. This crust is mostly made up of igneous rocks and is also a lot older than the oceanic crust. The continental crust can be divided into two parts. The upper part is made up of mostly granite rocks, and the lower part consists of basalt and diorite.