A ‘glacier table’ - a boulder perched on a pedestal of ice. Photographed on assignment during an ascent to the Chhota Shigri Glacier, Himachal Pradesh, Indian Himalayas. The boulder protects the ice from ablation during sunny weather. Around the boulder the ice surface ablates and, as a result, is lowered, whilst the boulder remains at the original level. As the pedestal becomes higher and higher in relation to the glacier surface, the sun shines further under the boulder from the south (in the northern hemisphere). Consequently the pedestal gets ablated on its southern side, and the boulder will eventually fall off the pedestal, usually on its southern side (in the northern hemisphere). After this a new cycle of table growth and destruction may begin.
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