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Snow line
Boundary between a snow-covered and snow-free surface / From Wikipedia, the free encyclopedia
This article is about the geographical feature. For the boundary in a protoplanetary disk, see Frost line (astrophysics).
The climatic snow line is the boundary between a snow-covered and snow-free surface. The actual snow line may adjust seasonally, and be either significantly higher in elevation, or lower. The permanent snow line is the level above which snow will lie all year.