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Loess is a deposit laid down by

  • A.wind, as silt carried far from its source
  • B.a river, as sand in its channel
  • C.a glacier, as unsorted debris
  • D.waves, as shingle on a beach

Answer: A

Correct answer: wind, as silt carried far from its source

Loess is wind-blown silt, characteristically derived from glacial outwash or from desert margins and carried hundreds of kilometres before settling. It is unstratified, remarkably uniform in grain size, and held together by a weak clay and carbonate bond that gives it the ability to stand in vertical faces - and that collapses when the deposit is wetted.

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