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Finnish researchers examined a 49-foot firn core, a length of densely packed snow turning to ice that can act as a natural recordkeeper of snow accumulation.—Troy Aidan Sambajon, Christian Science Monitor, 20 May 2025 The researchers dug into this portion of snow and extracted a 15-meter-long (about 50 feet) firn core that represented nearly a decade of snow accumulation.—Jack Knudson, Discover Magazine, 4 Mar. 2025 Ice and firn, or dense snow leftover from previous seasons, also disappeared from the ridge.—Kasha Patel, Anchorage Daily News, 18 Aug. 2022 But some research has suggested that the firn can fill up too quickly during years with high melt rates.—Chelsea Harvey, Scientific American, 2 Aug. 2019 The firn layer in the ice sheet, the boundary between snow and ice, is heating up and becoming denser.—Umair Irfan, Vox, 8 Dec. 2018
Word History
Etymology
German, from Old High German firni old; akin to Old English faran
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