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There is oceanic crust and continental crust. Oceanic crust is thinner and more dense than continental crust and is constantly being recycled via subduction upon collisions with continental crust, and creation at mid-ocean ridges.

Oceanic crust is rougly 3 to 4 miles thick (5 to 7 kilometers). Continental crust is roughly 20 to 30 miles thick (30 to 50 kilometers). The lower density of continental crust allows it to float on the mantle with high relief. Furthermore, oceanic crust is mainly made of basalt whereas continental crust is mainly made of granite.

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12y ago

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