Discussion
In the Thar desert of India one of the following is the most common and widespread sand dune type :
Answer: C
The most common and widespread dune type in the Thar is the parabolic dune.
Parabolic dunes are U- or V-shaped, with their arms pointing upwind and anchored by vegetation. The Thar is a relatively humid, partly vegetated desert under strong south-westerly monsoon winds, conditions that favour parabolic dunes, which studies of the Thar describe as its dominant dune type.
Barchans, crescent dunes with horns pointing downwind, form where sand is limited and vegetation absent, and occur only locally in the drier west. Star dunes need multidirectional winds and are rare, and seif (linear) dunes are present but less widespread.
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