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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 In contrast to the continental crust, the oceanic crust is young, thin, and chemically magnesium-rich. 2  Enormous pressures are produced in this region, for the continental crust and the oceanic crust are moving toward each other. 3  The continental slope connects the continental shelf and the oceanic crust.he relatively thin part of the earthâs crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.