How does the density of oceanic crust differ from that of continental crust? why is this difference important?

In terms of density, the oceanic crust is denser than continental crust, which also means it is heavier.Density is important in the formation of layers on Earth. Because continental crust is less dense, it floats higher than oceanic crust. If the two will have different densities, then continents will be submerged in the ocean.