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Blue-ice areas are regions of Antarctica where the ice surface has a blue colour, contrasting with the more common white Antarctic surface. They form around 1% of the continent's ice area. Blue-ice areas typically form when the movement of both air and ice are obstructed by topographic obstacles such as mountains that emerge from the ice sheet, generating particular climatic conditions where the net snow accumulation is exceeded by wind-driven sublimation and snow transports. They are noted for being hard and flat, enabling their use as a runway, in addition to their stability. Ice of up to 2.7 million years in age has been extracted from blue-ice areas. There are also large numbers of meteorites accumulated on them, either from direct falls or having been transported from elsewhere by ice flow. This NASA photograph shows a blue-ice area in the Miller Range, with a meteorite.Photograph credit: Nina Lanza / NASA
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