Yardangs are formed by the wind erosion of adjacent material that is less resistant. In other words, Yardang is a erosional feature formed by wind abrasion and deflation.
It is forms in originally flat surface in areas of harder and softer material. The soft material is eroded and removed by the wind, and the harder material remains.
Yardang is a elongated ridge-like sharp-crested landform, with a wind-faced front and a narrower end. Typical yardangs resemble an inverted boat hull
Yardang is a geological term that was introduced by Hedin, 1903 when he traveled the Lop Nur in northwestern China.
Typical yardangs occur mostly in large fields, and they are observed in arid to hyper-arid regions that have sparse vegetation and annual precipitation less than 50 mm.
Yardangs most commonly form in soft rocks such as siltstone and sandstone but can also form in harder rocks in places where the wind is the primary Erosional force.
These landforms are also found on Mars, Venus, Titan and in related forms on Pluto.
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