BRITISH ANTARCTIC SURVEY / SCIENCE PHOTO LIBRARY BRITISH ANTARCTIC SURVEY / SCIENCE PHOTO LIBRARY
Brunt Ice Shelf boundary (down centre) with the Antarctic Sea. An ice shelf is a sheet of ice that extends over the sea from land. The ice cliffs seen are up to 25 metres high. Icebergs (upper centre) form at ice fronts due to the weakening of the shelf caused by the action of the sea. Fast ice (sea ice) has frozen to the ice shelf (centre to bottom centre).
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