North Cascades a Guide to the North Cascades National Park Service Complex Wa
North Cascades a Guide to the North Cascades National Park Service Complex Wa
United States National Park Service Division of
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Gravity causes the resulting ice mass to flow downhill as a relentless river of ice. Its center flows faster than its sides, which meet more resistance from the land- scape. Flow rates can vary from an inch per day up to yards. Glaciers stabilize when their rates of snow accumu- lation and snowmelt equalize. When climate cools, the glacier front advances until a new equilibrium is reached. If climate warms, the glacier then retreats. Glacier ice both scours and plucks the land surface. A mounta...in glacier will gouge out a bowl-shaped amphitheater called a cirque. Two cirques that meet will be separated by an arete (liter- ally "fish bone"), a sharp ridge. The convergence of three cirques forms a horn- shaped peak . Where cirques break through each other, a saddle-like col forms. Lakes created in cirques are called tarns. Glaciers gouge stream- cut, V-shaped valleys into a U-shaped profile Where smaller, side glaciers enter a valley, the lower, larger gla- cier's deeper cut may give rise to hanging waterfalls.
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