My point to the change in the shape of the Earth. Also, instead of pressing down on the Earth as if to make it oval via weight of the caps, what if you applied equal pressure around it? I ask only because of what I saw on mythbusters, season4. They duplicated the safe from the movie "The Score". Drill and insert a bomb to make it blow the door off, didn't work. What they did is filled it with water, lowered the bomb in a then blew the door clean off by over 20 feet. They gave it equal pressure on the door to accomplish this. I wonder how that example could apply to the pressure on the Earth changing.