characteristics of seif dunes

Answer 1

• Seif dunes are a type of sand dune that have a linear shape and a uniform orientation, perpendicular to the prevailing wind direction. 
• They are usually taller and narrower than other types of sand dunes and can reach heights of hundreds of meters.
• Seif dunes are characterized by a slip face, a steep leeward slope that is created by the wind's action in removing sand from the crest and depositing it at the base. 
• They also typically have a well-defined crest and a relatively flat windward slope.
•  Seif dunes are found in desert regions with limited vegetation and are one of the fastest moving types of sand dunes, moving as much as tens of meters per year.