A moulin or glacier mill is a narrow, tubular chute, hole or crevasse through which water enters a glacier from the surface. The Athabasca Glacier is one of the six principal toes of the Columbia Icefield, located in the Canadian A crevasse is a Fracture in a Glacier caused by a large Tensile stress at or near the glacier's surface "Glacial" and "Glaciation" redirect here For the geological periods see Glacial period. They can be up to 10 meters wide and are typically found at a flat area of a glacier in a region of transverse crevasses. Moulins can go all the way to the bottom of the glacier and can be hundreds of meters deep, or may reach the depth of common crevasse formation (about 10-40m) where the stream flows englacially.
Moulins are a part of a glacier's internal "plumbing" system, to carry meltwater out to wherever it may go. Water from moulins often exits the glacier at base level, but occasionally the lower end of a moulin may be exposed in the face of a glacier or at the edge of a stagnant block of ice. Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia
Water from moulins may help lubricate the base of the glacier, affecting glacial motion. Glacial motion is the motion of Glaciers which can be likened to rivers of ice Given an appropriate relationship between an ice sheet and the terrain, the head of water in a moulin can provide the power and medium with which a tunnel valley may be formed. A tunnel valley is a deep but narrow Valley with a 'U' shaped cross-section and frequently a 'U' shaped plan which is usually found filled with glacial Till
See also
External links
- Earth Observatory page. A glacier cave is a Cave formed within the Ice of a Glacier. Glacier caves are often called Ice caves, but this term is properly used to describe Holocene glacial retreat had a profound effect on landscapes in many areas that were covered by ice at the Last Glacial Maximum. Firn is partially-compacted Névé, a type of Snow that has been left over from past seasons and has been recrystallized into a substance denser than Snake coils is a descriptive term used by physical geologist and glaciologists to describe the "snake coil"-like shape that occurs along certain Ablation
- December 2006 article about a NASA expedition to Greenland moulin. The National Aeronautics and Space Administration ( NASA, ˈnæsə is an agency of the United States government, responsible for the nation's public space program
- Moulins in Greenland (Google)
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