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Drift ice is sea ice that floats on the surface of the water in cold regions, as opposed to fast ice, which is attached ("fastened") to a shore. Usually drift ice is carried along by winds and sea currents, hence its name, "drift ice". When the drift ice is driven together into a large single mass, it is called pack ice. Typically areas of pack ice are identified by high percentage of surface coverage by ice e.g., 80-100%. An ice floe is a large piece of drift ice that might range from tens of yards to several miles in diameter. Wider chunks of ice are called ice fields. The two major ice packs are the Arctic ice pack and the Antarctic ice pack.
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