Hi satt: Interesting question. We would need to chop off everything more than about 1/2 kilometer above sea level, and dump it various places in the ocean. That would increase sealevel perhaps one kilometer. An exact calculation would be difficult as air and other vapors and gasses are perhaps 10% of the "solid" volume above 1/2 kilometer. These would bubble to the surface over time, lowering the sealevel perhaps 100 meters. The chopping and moving process would warm the crust significantly, so it would shrink significantly as it cooled back to a bit more than the present temperature over the next million years. Also the plate tetonics would be badly unbalanced and might restore much of the previous volume above sea level in a matter of hours. If we kept chopping it off as it rose out of the sea, the uprisings would eventually be smaller and less frequent, especially as we got more skillful at picking the best places to dump it a sea. What starting date do you suggest? Neil
Hi satt: Interesting question. We would need to chop off everything more than about 1/2 kilometer above sea level, and dump it various places in the ocean. That would increase sealevel perhaps one kilometer. An exact calculation would be difficult as air and other vapors and gasses are perhaps 10% of the "solid" volume above 1/2 kilometer. These would bubble to the surface over time, lowering the sealevel perhaps 100 meters. The chopping and moving process would warm the crust significantly, so it would shrink significantly as it cooled back to a bit more than the present temperature over the next million years. Also the plate tetonics would be badly unbalanced and might restore much of the previous volume above sea level in a matter of hours. If we kept chopping it off as it rose out of the sea, the uprisings would eventually be smaller and less frequent, especially as we got more skillful at picking the best places to dump it a sea. What starting date do you suggest? Neil
Regarding the initial gravity question:
At a distance r from the center of a sphere of uniform density of radius R (r<R), the effect of gravity is equivalent to being on the surface of a sphere of radius r. This is true because there is zero gravity inside a hollow sphere. The situation described above can be treated as two spheres: a solid sphere of radius r and a hollow sphere with internal radius r and external radius R.
