... include walruses and whales; fragile ecosystem slow to change and slow to recover from disruptions or damage natural hazards: ice islands occasionally break away from northern Ellesmere Island; icebergs calved from glaciers in western Greenland and extreme northeastern Canada; permafrost in islands; virtually icelocked from October to June; ships subject to superstructure icing from October to ... — The 1995 CIA World Factbook • United States Central Intelligence Agency
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