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Question
Briefly explain the three chief types of winds.
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Solution
- Permanent Winds: Permanent winds, also known as planetary or prevailing winds, blow consistently in the same direction throughout the year. These winds are created due to the Earth’s permanent pressure belts and the Coriolis effect resulting from its rotation. Examples include the trade winds, westerlies, and polar easterlies, which play a major role in global weather and ocean currents.
- Periodic winds: Periodic winds are those that change direction periodically, either daily or seasonally. They are influenced by the differential heating of land and water. For instance, monsoon winds change direction with the seasons,bringing rain in summer and dryness in winter. Similarly, land and sea breezes are daily periodic winds caused by the alternate heating and cooling of land and sea surfaces.
- Local winds: Local winds are limited to specific areas and occur for short durations. They arise from local temperature and pressure differences. For example, the Loo is a hot, dry wind that blows in parts of northern India during summer afternoons. Other examples include Chinook and Mistral, which influence the climate of the regions where they occur.
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