Snow that remains all year when the amount of snow that melts in summer is less than the amount of snowfall in winter. In high mountains such as the polar regions, the Himalayas, and South America, the perpetual snow that accumulates year after year melts and freezes repeatedly to become glaciers. The lower limit at which perpetual snow can form on high mountains is called the snow line. In Japan, perpetual snow can be found on Mount Fuji, Mount Tateyama, Mount Gassan, and Mount Chokai, but all of these are caused by topographical conditions. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
冬の降雪量に比べて夏の融雪量のほうが少い場合に一年中残る積雪。極地方やヒマラヤ,南アメリカなどの高山では,年々蓄積された万年雪は融解,凍結を繰返して氷河となる。高山では万年雪のできる下方限界を雪線という。日本では富士山,立山,月山,鳥海山などに万年雪があるが,これらはいずれも地形的な条件によってできたものである。
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