ice shelf 
noun
A floating sheet of ice permanently attached to a land mass.A floating ice shelf is like the crust of the earth floating on the earth's plastic mantle....
- In the 1990s a berg the size of Oxfordshire broke off the Antarctic ice shelf and was widely hailed as proof of global warming.
- However, this trend could be a result of the greater distance from the source of evaporation beyond the edge of an ice shelf to the accumulation site as the ice shelves grew slowly equatorward.