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WAIS Divide Ice Core: Horizontal thin section from 400 meters depth in the WAIS Divide ice core under cross-polarized light showing the size, shape, and orientation of individual ice crystals | by U.S. Ice Drilling
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WAIS Divide Ice Core: Horizontal thin section from 400 meters depth in the WAIS Divide ice core under cross-polarized light showing the size, shape, and orientation of individual ice crystals

Horizontal thin section from 400 meters depth in the WAIS Divide ice core under cross-polarized light showing the size, shape, and orientation of individual ice crystals. The different colors are due to the different orientations of the crystals. The small circles are entrapped atmospheric air bubbles. These samples of ancient air provide scientists and policy-makers with direct evidence of past atmospheric composition.

Credit: John Fegyveresi (jmf439@psu.edu)

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Taken on June 11, 2008