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- Dictionarydry valley
noun
- 1. a valley cut by water erosion but containing no permanent surface stream, typically one occurring in an area of porous rock such as limestone.
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Dry valley. A dry valley may develop on many kinds of permeable rock, such as limestone, chalk, sand stone and sandy terrains that do not regularly sustain surface water flow. Such valleys do not hold surface water because it sinks into the permeable bedrock.
The McMurdo Dry Valleys are a row of largely snow-free valleys in Antarctica, located within Victoria Land west of McMurdo Sound. [1] The Dry Valleys experience extremely low humidity and surrounding mountains prevent the flow of ice from nearby glaciers.
Jul 2, 2012 · Discover McMurdo Dry Valleys in Antarctica: One of the most extreme deserts in the world, these snow-free valleys harbor life, despite the hostile environment.
May 21, 2018 · dry valley A linear depression that lacks a permanent stream but shows signs of past water erosion. It is a common land-form in areas underlain by permeable rock (e.g. the chalk of southern England).
The Dry Valleys are an Antarctic anomaly. While most of the continent is covered in a thick layer of ice, the dry, frigid Valleys are almost entirely ice-free, an arid expanse of mostly dirt, small rocks, and big boulders.
A valley, usually in chalk, or karst, with no permanent watercourse. These valleys may have been cut during periglacial phases, when the permafrost would stop meltwater from soaking through chalk or limestone, and thus permit dissection.
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Jun 7, 2012 · Completely devoid of terrestrial vegetation, the region is considered one of the most extreme deserts and the driest place on the planet. At 4,800 square kilometers, the valleys constitute around 0.03% of the continent, and form the largest ice-free region in Antarctica.
