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Layers that are less dense, such as the crust, float on layers that are denser, such as the mantle. Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust.This is partly why the continents are at a higher elevation than the ocean floor.ayers that are less dense, such as the crust, float on layers that are denser, such as the mantle. Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust.
1 Oceanic crust-The crust under the oceans is about 10 km thick and is generally made up of rock rich in iron and magnesium. 2  These are primarily basalt formed by volcanic action at the mid ocean ridges. 3  The oceanic crust is denser than continental crust. Continental crust (continental cratons) - Where there are continents the crust is about 30 to 50 km thick. 2  It is made up of igneous, metamorphic, and sedimentary rocks. 3  The continental crust is less dense than the oceanic crust.