题目内容

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.

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Desert Pavement: is a desert surface covered closely packed, interlocking angular or rounded rock fragments of pebble and cobble size.

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What is a(n) smooth, polished rock that has been abraded by the wind?

A. Blowout
Bajada
C. Inselberg
D. Ventifact

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Why is it so difficult for wind to pick up clay-sized particles?

A. They are too large for the wind to carry
B. The wind has a near-zero velocity closest to the surface and can't pick them up
C. The clay particles are often buried under larger sediments
D. There is too much clay to carry

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Wind can transport sediments through different ways, which are:

A. traction of small pebbles
B. saltation of sands and silts
C. suspention of silts and calys
D. dissolution of ions

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