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During 31 January 2002-7 March 2002 the Larsen B ice shelf in Antarctica collapsed and broke up, 3,250 km² of ice 220 m thick disintegrated in a single season.

Glaciologists were surprised at the speed of the collapse, which they attributed to warm ocean currents melting under the shelf, and also ponds of meltwater on the surface of the shelf. This water melted during the 24 hours of daylight and worked down through cracks and fissures in the ice, acting like wedges to separate the shelf from the mainland.

The Larsen B ice shelf has been stable for more than 12 000 years.

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