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The snow line of a place is not a fixed location. Seasonal variation can be caused by the rise and fall of the snow line, the temporary phenomenon of the snow line is called the season. Only the location of the snow line in summer is relatively stable each year back to the relatively high fixed, due to this reason, a high degree of determination of the snow line in the hottest summer months. Around the world, the snow line from the equator to the poles is reduced. The northern slope of Mount Everest snow line altitude of about 6000 meters, and in the north and south pole on the lowering of the snow line at sea level. Glaciology snow line is an important symbol, which controls the development and distribution of glaciers. Only a high hill over the snow line will have an annual surplus of snow accumulated.to become a permanent snow and glaciers of the region development.
In the valley close to the Peak and the source of the local watershed, always form a funnel catchment terrain. When the cooling time of the beginning of the development of glaciers, the funnel near the top of the catchment, the first occupied for the snow and ice. Snow and ice accumulated in the catchment funnel to a certain extent, the occurrence of the flow from glaciers. Glacier on the edge of the trough and its plane has a huge role in corrosion, which, like a carpenter39s plane and continue to work as a file, the original funnel catchment erosion gradually into a plane is surrounded by mountains, like a wicker chair-like V-shaped basin. This terrain is called cirque. Most of cirque development in the vicinity of the snow line on the elevation.
General valley glaciers, ice climb Hom often to see the vast snow-firn basin. When the glaciers disappeared, this is a cirque Pendentifs de perles lake floor. Alpine cirque lake can be seen often, they are regularly distributed in a certain height, representing the era of the ancient glaciers of the snow line height.