Ice sheet
Ice sheet is a thick ice cover, which is spreading under the force of its own weight on the surface of many thousands square kilometers. The process of its formation is the same as in the case of glaciers.
The largest ice sheets are: Greenland ice sheet (with the area of 1 730 000 km2) in the northern hemisphere and Antarctic ice sheet (its covers, along with ice shelves, the surface of 13 829 000 km2) in the southern hemisphere. About 99% of all glaciers in the world come from them (91% of which from Antarctica itself).