Also the average thickness of oceanic crust is ~8km whilst continental is ~35km, due to the density contrast the oceanic margins subduct under the continental plates.
Also interesting the oldest continental crust is ~3.8 Billion years whilst the oldest oceanic is ~200 million, which demonstrates the continued recycling of oceanic crust into the mantle, which produces the iterative process that generates the earths continental crust through magmatism.
the earths hot spots, page-3
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