Discussion
Most of the dust carried and deposited by dust storms is in the form of silt-size particles which are known as .......... .
Answer: C
Such wind-deposited silt is called loess.
Loess is a yellowish, unstratified deposit of silt-size particles (about 0.002-0.06 mm) carried by the wind from deserts and from glacial outwash plains and laid down far away. The thick loess of the Loess Plateau of China, from Gobi dust, and the loess of the Mississippi valley and central Europe are classic examples, and they form very fertile soils.
Dunes are mounds of wind-blown sand, not silt; tufa is a calcium carbonate deposit from springs; and colluvium is loose material moved down slopes by gravity.
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