They vary
a sand dune that goes on in a long line
a sand dune that goes on in a long line
the top of a sand dune is called the crest of the dune.
A hill of sand in a desert is normally referred to as a dune
about 10 years
A sand dune is a landform, not a climate.
A sand dune is the deposition of windblown sand.
A sand dune is a pile of wind-blown sand.
A sand dune that got blown away
A sand dune is a Constructive force.
A Sand Dune, more specifically a "Seif Dune" or a "Barchan Dune".
small hill of sand caused by the action of wind