Esker
A esker (of the Irish “to eiscir”) or a ös (to pronounce have ) is a glacial formation appearing itself as a hillock lengthened sometimes on hundreds of meters length.
The eskers are formed in tunnels under glaciers. When the glacier is withdrawn from a valley, materials (stones of various sizes) settle in the tunnels located at the base of the glacier and borrowed by subglacial rivers.
Once the glacier melted, the “moulding” obtained of the tunnels remains by forming eskers.
The eskers are not very current in the the Alps but are frequent in Scandinavia.
The mission Mars Odyssey of NASA located several eskers on the planet Mars thanks to its spectro-imagor THEMIS. They are probably these eskers Martians which gave the illusion of channels to one time when our telescopes suffered from an insufficient resolution.
See too
Related articles
External bond
- Origin and photographs of eskers
- a esker on the planet Mars (Credit: NASA/JPL/Arizona State University)
References
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