...Then the temperature of the frozen soil drops, and the freezing progresses further down. Only the active layer at the very surface melts and freezes; below that is the soil that never melts, the permafrost. It is currently distributed widely in Siberia, Alaska, northern Canada, and the interior of China, covering an area of 21×10 6 km2, or 14% of the total land area on Earth. *Some of the terminology that refers to the "active layer" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…そして凍土の温度が下がり,さらに下方へと凍結が進む。溶けたり凍ったりするのは,ごく表層の活動層だけで,その下には永久に溶けることのない土,永久凍土がある。その分布は現在,シベリア,アラスカ,カナダ北部,中国奥地に広くひろがり,面積は21×106km2で,地球上の全陸地の14%を占める。… ※「活動層」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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