题目内容
Loess is clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust.
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Wind Blown Dust consists of silt and clay sized particles that are often packed together with smooth surface. Such packed dust is difficult to remove by wind erosion alone, unless the surface is very dry or is disturbed. When dust is disturbed, dust storms may develop, and dust may be transported by the wind over large distances.
Which are the following landforms belongs to the major types of sand dunes?
The angle of the windward slope of a dune varies with wind velocity and grain size but is always much less than that of the slip face.
The lee face of an active dune is called the slip face.
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