题目内容
Which are the following landforms belongs to the major types of sand dunes?
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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.
A yardang is a streamlined protuberance carved from bedrock or any consolidated or semi-consolidated material by the dual action of wind abrasion by dust and sand, and deflation which is the removal of loose material by wind turbulence.
Desert Pavement: is a desert surface covered closely packed, interlocking angular or rounded rock fragments of pebble and cobble size.
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