Permafrost is ground that stays frozen year round; the permafrost in interior Alaska also has massive wedges of actual ice locked within the frozen ground. When that ice melts, the ground surface collapses and forms a sinkhole that can fill with water. Thus, a thermokarst lake is born. At first glance, Big Trail looks like any lake. But look closer and there's something disturbing the surface: bubbles.
Millions of small black flies have taken over mountains and hiking trails. "I thought it was horrible," says Pernille Frøskeland.
One person was evacuated and brought to safety after the landslide at Kråkneset in Alta municipality. A total of eight buildings were swept to the sea in the 650-metre landslide. Due to a high avalanche risk, police have still not entered the area.
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