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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 is uniform in thickness and composition. 2  It is 5-6 km thick and is mafic in composition. 3  The differences in thickness and density between continental and oceanic are responsible for the existence of ocean basins due to isostatic balance as the crust floats on the more dense mantle. The crust: low density silicate rock, 5-70 km thick. 2  There are two distinct types of crust. 3  Continental crust is variable in thickness and composition. 4  Thickness ranges from 5-70 km.