It's supposed to fall as snow, and form from the top down...
(NEWSER) - Ice in Antarctica is supposed to form from the top down, the result of falling snow. But researchers who scanned an Antarctic mountain range with lasers and radar have discovered new ice developing at the bottom of miles-thick ice sheets ... and altering the surface. The earth’s heat melted the glaciers from below, and the water refroze, notes NPR —leaving "plumes" of ice thousands of feet thick. While scientists have known for more than a decade that liquid water forms under the continent, "this is showing that the water can actually change the overlying ice sheet"—so forcefully, in fact, that it can alter the shape of the surface as far as two miles above. More»
