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Explanation: This happens because the air is much below freezing, and the water temperature is half a degree up to a few degrees above. The 90% of the iceberg that is underwater slowly melts in the relatively warm water, while the 10% that is above water doesn't because of the cold air. This eventually makes the iceberg top-heavy and unstable. This is why sometimes icebergs have to do a barrel roll. This happens all the time, but it is seldom that it is captured on video when it happens."
Location: Upsala Glacier, a large valley glacier in Argentina's Los Glaciares National Park.   Map

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