It began forming in the late Pliocene epoch.
The weight of the ice.
You can pick any two you want. From the Wikipedia entry: here is a list of the ice shelves, listed clockwise, starting in the West of East Antarctica. An ice sheet is included in the list: "Filchner Ice Shelf "Brunt Ice Shelf "Riiser-Larsen Ice Shelf "Quar Ice Shelf "Ekstrom Ice Shelf "Jelbart Ice Shelf "Fimbul Ice Shelf "Lazarev Ice Shelf "King Baudouin Ice Shelf "Hannan Ice Shelf "Zubchatyy Ice Shelf "Wyers Ice Shelf "Edward VIII Ice Shelf "Amery Ice Shelf "Publications Ice Shelf "West Ice Shelf "Shackleton Ice Shelf "Moscow University Ice Shelf "Voyeykov Ice Shelf "Cook Ice Shelf "Slava Ice Shelf "Gillett Ice Shelf "Nansen Ice Sheet "McMurdo Ice Shelf "Ross Ice Shelf "Swinburne Ice Shelf "Sulzberger Ice Shelf "Nickerson Ice Shelf "Getz Ice Shelf "Dotson Ice Shelf "Crosson Ice Shelf "Cosgrove Ice Shelf "Abbot Ice Shelf "Venable Ice Shelf "Stange Ice Shelf "Bach Ice Shelf "George VI Ice Shelf "Wilkins Ice Shelf "Wordie Ice Shelf "Jones Ice Shelf "Müller Ice Shelf "Prince Gustav Ice Shelf "Larsen Ice Shelf (Larsen A and B) "Ronne Ice Shelf"
An ice shelf is a floating ice platform attached to a coast, while an ice sheet is a vast expanse of land ice covering an area larger than 50,000 square kilometers. Ice shelves are mostly found in Antarctica and Greenland, whereas ice sheets cover large portions of Antarctica and Greenland, as well as parts of the Arctic.
the Ross ice shelf
Because Greenland's ice shelf is melting, while the Antarctic's is increasing in depth.
an ice shelf is a shelf of ice, which is floating on the water. There are several large ice shelves around Antarctica.
About 80% of Greenland's land surface is covered by ice.
The Greenland ice sheet covers about 80 percent of Greenland! It's the second-biggest ice sheet in the world, after Antarctica
the Ross ice shelf
because when it has no ice its all green
A few are named below: Ross ice shelf Ronne/Filchner ice shelf Riiser-Larsen ice shelf Larsen ice shelf
greenland ice