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Appat Island, Greenland. Aerial view over the snow-covered Saunders Island and Wolstenholme Fjord, Greenland, with Kap Atholl in the background. The waters of Wolstenholme Fjord are fed by four large glaciers: the Salisbury Glacier, Chamberlin Glacier, Knud Rasmussen Glacier and Harald Moltke Glacier. Sea ice coverage in the fjord ranges from thicker white ice seen (background), to thinner grease ice and leads showing open ocean water (foreground). Photographed during an Operation IceBridge survey flight in April 2013. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/Michael Studinger/SCIENCE PHOTO LIBRARY)