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Greenland's Sweaty Summer

By Amelia Hennighausen - 2012-08-06T15:47:15Z

Photograph by James Balog/Aurora Photos

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Ancient Air Bubbles

A 6-inch clump of cryoconite dust absorbs more heat than the surrounding white, which melts the ice above it. Ancient air pockets trapped by snowstorms 5,000 to 10,000 years ago bubbled to the surface, where overnight temperatures refroze the ice and trapped them again.

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