Biology Forums - Study Force

Briefly explain how the geological conditions that produced and deposited loess have determined the
  sites of the world's major grain belts. What will be an ideal response?

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Q. 2 - What are the three main sources from which loess is derived? What will be an ideal response?

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Q. 3 - What are the four major dune types generally recognized? What will be an ideal response?

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Q. 4 - What factors affect the type of dune that forms? What will be an ideal response?

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Q. 5 - How do sand dunes migrate? What will be an ideal response?

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Q. 6 - What are deflation hollows? What will be an ideal response?

(Answer to question 1 )  

Because loess derived soils are some of the most fertile in the world, the locations where large loess
deposits have occurred have developed into some of the most productive farmland.

(Answer to question 2 )  

Loess sediments are derived from deserts, Pleistocene outwash deposits, and floodplains in semiarid
regions.

(Answer to question 3 )  Barchan, longitudinal, transverse, parabolic.

(Answer to question 4 )  Factors include vegetation coverage, direction and velocity of wind, and the amount of available sand.

(Answer to question 5 )  

Sand dunes migrate by the saltation of sand on a dune's windward side and collapse of the leeward
slope.

(Answer to question 6 )  Deflation hollows are shallow depressions created by differential wind erosion of surface materials.

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