Answer
Basic dune types include:
a. Barchan dunes: Crescent-shaped dunes with horns pointing downwind. They form in areas with limited sand and an unidirectional wind.
b. Transverse dunes: Long, straight dunes perpendicular to the wind direction, forming in areas with abundant sand and unidirectional wind.
c. Seif dunes: Similar to barchan dunes but longer and more linear, often forming chains.
d. Parabolic dunes: U-shaped dunes with horns pointing upwind, typically found in areas with vegetation stabilizing the sand.
e. Star dunes: Complex dunes with multiple arms, forming in areas with variable wind direction.
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