1. Wind speed is influenced by the topographical features. |
2. The effect of surface friction extends to a height of about 500m (1650 ft) |
3. Rougher surfaces produce more friction. |
4. Wind speed changes according to pressure gradient. |
A) 1 and 2only
B) 1, 2 and 3 only
C) 1, 2, 3 and 4
D) 2, 3 and 4 only
Correct Answer: C
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