Virtual oceans of waters below the surface of the earth coming into contact with vast stores of magma would certainly trigger incredible high pressure events that would at least play a significant role in crustal displacement, scientists envisioning explosive events with resulting ejection of materials miles high into the atmosphere. Add countless earthquakes occurring worldwide and the resultant crustal shift. Most, or a lot, of geologists believe all the continents were basically one land map. Now you can imagine the earths crust slowly inching along for millions of years, or throw in a catastrophe involving the equivalent of low and high yield atomic bombs going off dozens or hundreds of time, and I think significant crustal movement might see a more likely outcome.