The earth is constantly changing. So this is all part of it. We have had ice ages, all land masses were one super continent at one time. I believe it was called Pangea. Anyway this goes for everything. We too are still evolving along with all other life. The earth will be ever changing. It just happens very slowly so it is hard to notice it if at all. Volcanoes erupting on the other hand are very hard to miss. That's why you have drawn attention to it. It is something we can actually see happening. As always @humanearl great post my friend.