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Oceanic crust is made up of several layers with the topmost layer being just 500 meters thick.
Is granite oceanic crust. The difference in composition between the mantle and the two layers of the crust is maintained by. Continental crust is broadly granitic in composition and with a density of about 2 7 grams per cubic cm is somewhat lighter than oceanic crust which is basaltic i e richer in iron and magnesium than granite in composition and has a density of about 2 9 to 3 grams per cubic cm. By contrast the continental crust is made up of light colored granite rocks full of substances like oxygen and silicon. It is thinner denser younger and of different.
It is composed of several layers not including the overlying sediment. The oceanic crust is mainly made out of dark basalt rocks that are rich in minerals and substances like silicon and magnesium. Continental crust is typically 40 km 25 miles thick while oceanic crust is much thinner. The crust overlies the solidified and uppermost layer of the mantle the crust and the solid mantle layer together constitute oceanic lithosphere.
On the other hand continental crust remains where it is for billions of years and it is much older than oceanic crust. Oceanic crust is about 6 km 4 miles thick. This is made up of basaltic rocks in the shape of pillows and sheets. The topmost layer about 500 metres 1 650 feet thick includes lavas made of basalt that is rock material consisting largely of plagioclase and pyroxene oceanic crust differs from continental crust in several ways.
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