Yeah subduction is the missing key that took a while for us to understand. Ocean crust is young. In fact most earthly rock is relatively young. Plate tectonic

Yeah subduction is the missing key that took a while for us to understand. Ocean crust is young. In fact most earthly rock is relatively young. Plate tectonics was such a clever idea. So obvious now, I mean just look at a map of the world of course continents were once one, you can see where they join, like a jigsaw puzzle. It astonished early western explorers finding seashells on mountains!