Longitudinal sand dunes move slowly at the rate of _____ per annum:
Correct answer: B. 10 meters
- A. 5 meters
- B. 10 meters
- C. 20 meters
- D. 30 meters
Explanation
Longitudinal dunes generally migrate slowly compared with transverse dunes, with a commonly cited movement rate of about 10 metres per year. Hence option b is correct.
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