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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.
Crustal plates (tectonic plates) are the outer shell of the Earth. Continental crust and oceanic crust are the two main types of plates.Large plates like the North American Plate is considered a continental plate but also contains oceanic crust. Continental crust which contains the interior of the large continents is much older than oceanic plates.rustal plates (tectonic plates) are the outer shell of the Earth. Continental crust and oceanic crust are the two main types of plates.