Broken sea ice emerges from under the hull of the Finnish icebreaker MSV Nordica as it sails through the Victoria Strait while traversing the Arctic's Northwest Passage, Friday, July 21, 2017. As a general rule, the older ice gets the more it turns blue and acquires mounds, so-called hummocks, on top from years of crashing into other floes. (AP Photo/David Goldman)
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