Istostasy and mountains

This picture is say about the istostasy collide and moving up.Therefore,the mountains are keeping up and teller.Also when time is long,the mountains were gone.Later were go up again.

The thick part of the continent float higher than the thinn part,all the thick are pushing each

of them.And the ice cube floats because it light per unit volume than water , ice is less dense than liquid water.The ice cube may weigh a few ounce,and rise a centimeter above the water surface

.An ice might weigh millions of tons, but float a hundred feet out of the water, because it is vast heavier than the ice cube.