Question

Write a short note on wind.

Answer 1

Wind:

1. The uneven heating of land and sea results in an unequal expansion of air.
2. The air that is in contact with hot surfaces gets heated by conduction and rises since its volume increases, thereby decreasing the density.
3. The rising of this heated air causes a low-pressure zone that attracts air from the surrounding regions too.
4. Thus, a recurring cycle of heated air rising and being replaced by air from high-pressure sets in. This unequal heating of land and sea and the movement of air resulting from it gives rise to winds.
5. Winds may be caused due to pressure differences or temperature variations leading to the formation of depressions and anticyclones or convection and advection currents respectively.