Are sand dunes stationary or do they move and migrate? What ...

[chads108]

Are sand dunes stationary or do they move and migrate?
 
  What will be an ideal response?

Question 2

Sand dunes form
 
  A) where air flows freely over sand.
  B) from wind that is increasing in speed.
  C) as wind moves sand from the back to the front of the dune.
  D) as wind stops blowing.

[Galvarado142]

Answer to Question 1

Answer: Sand dunes migrate. The whole mound of sand moves downwind as sand grains on the windward slope move up and over the crest of the dune to fall on the leeward slope. Sand removed from the back of the dune is redeposited on the front of the dune. Over time, this continuous process moves the entire dune.

Answer to Question 2

Answer: C

[chads108]

Gracias!

[miss_1456@hotmail.com]

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