How does a dune form?

wind forms them by blowing sand around.

as the sand is loose if vegetation, amount and type of sand. sand is loose and will migrate (move), due to the wind. sand dunes mostly form when there is an obstacle, the sand builds around the...

a long, long time

Wind forms sand dunes by picking up dry sediments and accumulating them over time to create over time.

Sand particles can be carried away by strong winds. These particles eventually fall when the wind if not strong enough to keep them aloft. Sand dunes form in areas where wind routine occurs. The...