Wind
Running water
Glacier
None of the above
Answer is Wrong!
Answer is Right!
The correct answer is (a). Barkhan is a type of sand dune that is formed by wind. It is crescent-shaped, with the tips pointing downwind. Barkhan dunes are common in deserts and other areas with strong winds.
(b) Running water can form a variety of landforms, including river valleys, deltas, and waterfalls.
(c) Glaciers can form a variety of landforms, including moraines, cirques, and fjords.
(d) None of the above is correct.