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A cross-section through a glacier. The base of the glacier is more transparent as a result of melting. Glaciers may also move by basal sliding, where the base of the glacier is lubricated by the presence of liquid water, reducing basal shear stress and allowing the glacier to slide over the terrain on which it sits.
English: Geologic Cross section of Glacier National Park, Montana, USA. Showing the Lewis overthrust fault and the proterozoic rocks above it, with English captions.
Cross section of a cirque glacier showing the bergschrund A bergschrund—the long crack at the foot of the mountain slope—in the Ötztal Alps Open bergschrunds at Mont Dolent. A bergschrund (from the German for mountain cleft) is a crevasse that forms where moving glacier ice separates from the stagnant ice or firn above. [1]
Part of the glacier where snow builds up and turns to ice moves outward from there. The glacier head is the highest upslope edge of an alpine glacier or the upslope end of the zone of accumulation. The head of the glacier comes up against a steep bedrock cliff called a cirque headwall [2] Cross section of a cirque glacier showing the bergschrund
Glacier morphology, or the form a glacier takes, is influenced by temperature, precipitation, topography, and other factors. [1] The goal of glacial morphology is to gain a better understanding of glaciated landscapes and the way they are shaped. [ 2 ]
They have a characteristic U shape in cross-section, with steep, straight sides and a flat or rounded bottom (by contrast, valleys carved by rivers tend to be V-shaped in cross-section). Glaciated valleys are formed when a glacier travels across and down a slope, carving the valley by the action of scouring. [2]
Cross section of a cirque glacier showing the randkluft. A randkluft (from the German for marginal cleft/crevasse) or rimaye (from the same French IPA:) is the headwall gap between a glacier or snowfield and the adjacent rock face at the back of the cirque [1] or, more loosely, between the rock face and the side of the glacier.
The upstream portion – that section furthest into the glacier – consists of a branching system forming a network, similar to the anastomostic branching patterns of the upper reaches of a river (as contrasted with dendritic patterns). They typically exhibit the largest cross-sectional area in the center of the course and terminate over a ...