...One type is formed on flat, vast continents and is called a continental glacier or ice sheet. The other type is formed on high mountain areas with large undulations and is called a mountain glacier or valley glacier. Because ice sheets are flat, they do not flow actively, but when they are 2,000 to 3,000 meters thick, they begin to slope and flow slowly. ... *Some of the terminology that mentions "valley glacier" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一つは平坦で広大な大陸に形成されているもので大陸氷河continental glacierあるいは氷床ice sheetと呼ばれる。もう一つは起伏の大きい高山地帯に形成されているもので山岳氷河mountain glacierあるいは谷氷河valley glacierと呼ばれる。氷床は平坦であるために流動は活発でないが,2000~3000mもの厚さをもつことによって初めて傾斜を生じ,ゆるやかな流動が起こる。… ※「valley glacier」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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