Discussion
Flat topped sand ridges with long dimensions extending parallel to the prevailing winds but locking the collapsing fronts are known as
Answer: A
Flat-topped sand ridges that lie parallel to the prevailing wind are known as whalebacks.
Whalebacks are large, low and broad sand ridges of arid regions with flat tops and no clear slip faces, running along the wind direction.
Seifs (option B) are long, sharp-crested longitudinal dunes. Barchans (option C) are crescent-shaped dunes with horns pointing downwind. Sand drifts (option D) are small accumulations of sand behind obstacles and do not form ridges of this kind.
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