The Ross Ice Shelf and the Ronnie Ice Shelf are the two biggest ice shelves in Antarctica.
You may be thinking of the Ross Ice Shelf or the Larson Ice Shelf.
You may be thinking of the Ross Ice Shelf, and the Larson Ice Shelves.Other major ice shelves are named Ekstrom, Amery, West, Shackleton and Voyeykov.
Several of the ice shelves attached to Antarctica are disintegrating because the sea water is melting them from below.
Melting of Antarctica's ice shelves occurs underwater, based on warming ocean water. which melts the shelves from underneath. This phenomenon occurs all year and is not limited to summer.
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Icebergs (drifting ice) in Antarctica have broken off from the glaciers and ice shelves that stretch out over the sea at the continent's coastline.
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Your question is really about ice shelves, not the Antarctic ice sheet. The ice shelves are deteriorating because of warmer ocean waters that melt the ice shelf from below.
an ice shelf is a shelf of ice, which is floating on the water. There are several large ice shelves around Antarctica.
Ice shelves in Antarctica form barriers to continental land, but are so large as to be effectively connected to the continent permanently. Ice shelves can be extremely tall -- hundreds of feet -- above the water line and so deep -- hundreds of metres -- as to make the water under them impenetrable by current technologies.
You may be thinking of the Ross Ice Shelf and the Larson Ice Shelves.
Antarctica's ice sheet rests on 98% of the continent. It has been said that the ice is so heavy, ". . . In East Antarctica, the ice sheet rests on a major land mass, but in West Antarctica the bed can extend to more than 2,500 m below sea level." Quoted from the Antarctic Ice Sheet entry in Wikipedia. This is some, not most of the ice sheet. Ice shelves exist mostly below sea level.