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In this July 15, 2011 photo, the "Yeti," a tractor-like autonomous robot, is tested for eventual deployment of ground-penetrating radar, at Summit Station, a remote research center operated by the U.S. National Science Foundation (NSF), and situated 10,500 feet above sea level, on top of the Greenland ice sheet. Across Greenland's vast white landscape, teams of researchers are searching for clues to the potential effects of global warming on Greenland's ice. (AP Photo/Brennan Linsley)

Greenland's ice: beauty and threat

Greenland's Inuit people have countless terms in their language to describe ice in all its varieties. This gallery of photographs by AP's Brennan Linsley likewise is something of a visual vocabulary for the striking and beautiful forms ice takes on and around the giant Arctic island.