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Roberto Martinez
continent is actually depressed 300 meters by the sheer weight of the ice cap covering it. If global warming were to melt even half of that ice would that trigger catastrophic worldwide effects on continental plate movement? Seeing that ice shelf break off the Antarctic coast the other day in the news got me wondering as well.
Note that the hole is insulated from heat and is sealed of in a vacum. Therfore air and temperature would not affect it.