题目内容
A(n) ________ is a sharp, knife-edged ridge that forms between two valley glaciers.
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The continental glaciers are enormous, thick ice sheets covering vast areas of continents. They are not confined to valleys, but spread over all the land surfaces.
On the basis of size and shape, we can easily divide glaciers into two general types, the valley glacier or mountain glacier.
The snowline is a momentary line delimiting an area or altitude with complete snow cover in summer. It is also called firn line.
Glacier is a large mass of ice formed, at least in part, on land by the compaction and recrystallization of snow, moving slowly by creep down slope or outward in all directions due to the stress of its own weight, and surviving from year to year.
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