| http://www.w3.org/ns/prov#value | - BTW, before the current mid-ocean ridge arrangement, during the last supercontinent phase [now, you might want to put a bag over your head because your mind is about to be blown] there was a different arrangement of of mid-ocean ridges and those change over time, as did the positions of the continents, and just how much continental crust there was, all the way back.
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