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snow winter forest trees landscape nature scenery cold ice frost snowflakes snowfall blizzard pine trees evergreens conifers woods timberland taiga boreal forest subarctic forest temperate forest deciduous forest broadleaf forest rainforest tropical forest jungle mangrove forest swamp forest peat forest cloud forest montane forest subalpine forest alpine forest tundra arctic antarctic north pole south pole ice cap glacier permafrost snow line tree line timberline forest ecology