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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.
Oceanic crust may be heavier and denser, but continental crust is thicker and older. The depth of continental crust varies more than oceanic crust and can be anywhere between six and 47 miles thick. The rocks that make up continental crust are less dense and heavy than basaltic ocean crust.