Comparing Oceanic Crust And Erath

Oceanic crust makes up about 0.1 percent of the Erath but its life cycle assists in separating the material of the upper mantle into a heavy remains and a lighter set of basaltic rocks. It also removes the incompatible elements, that don't fit into mantle minerals and move into the liquid melt. These then move into the continental crust as plate tectonics proceeds. In the meantime, the oceanic crust reacts with seawater and brings some of it down into the mantle.
Continental crust is about 50 km thick, about 2 billion years old, and it covers about 40 percent of the planet. While almost all of the oceanic crust is underwater, most of the continental crust is exposed to the air.
The continental crust is consists of granitic rocks, which have