A moving air is called a wind. We can observe the wind moving by the movement of objects such as leaves and plants. The wind power can be used to generate electricity in windmills and recreation purposes in hot air balloons. The types of winds are -
1. Planetary wind
2. Trade wind
3. The Westerlies
4. Periodic winds such as Monsoon winds, land breeze, sea breeze, mountain and valley breeze.