Sand particles can be carried away by strong winds. Theseparticles eventually fall when the wind if not strong enough tokeep them aloft.Sand dunes form in areas where wind routine occurs. The dunesstart when an obstruction of some sort acts as a barrier to blockthe wind. The wind slows down when it hits the barrier, allowingthe sand particle to fall to the ground Eventually, theobstruction, which may be a stump or rock, will become completelyburied by sand. The dune continues to grow by the same process asmore and more sand particles are released by the winds that slowdown when they hit the dune.Interestingly, dunes move slowly. This occurs when the windlifts sand up on the windward side and the sand falls down on theleeward side.cool