冰川作用,广义上泛指冰川的生成、运动和后退。狭义上仅指冰川运动对地壳表面的改变作用,包括冰川的侵蚀、搬运和堆积。冰川运动的前端叫冰前。供冰量大于消融量,则向前推进,反之向后推进。
n. glaciation
misc. glacial action
... glacial accretion 冰川加积作用 glacial action 冰川作用 glacial advance 冰川前进 ...
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这些山丘是冰川作用形成的。
很明显冰川作用就发生在相对不远的过去,因为漂流物很软,像新鲜的沉积物。
It was apparent that the glaciation occurred in the relatively recent past because the drift was soft, like freshly deposited sediment.
然而,使所有的黑土形成冰川作用的问题是,在前寒武纪沉积物中广泛分布有黑土。
The problem with ascribing all tillites to glaciation, however, is that tillite deposits are widespread in Precambrian sediments.
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