Which among the following wind is associated with extreme cold and dryness?
- A.Monsoon Winds
- B.Westerlies
- C.Trade Winds
- D.Polar Easterlies
Show answer
Correct answer: D. Polar Easterlies
Explanation
The correct answer is D, Polar Easterlies. The polar easterlies blow out of the high pressure belts over the poles towards the sub-polar low pressure belts, so they carry extremely cold and dry air. Cold air holds very little moisture, which is why these winds bring almost no rain and the polar regions are counted among the driest places on earth. They are one of the three planetary wind systems, along with the trade winds and the westerlies, and where they meet the warmer westerlies near sixty degrees latitude they form the polar front, the birthplace of temperate cyclones. Option A is wrong because monsoon winds reverse with the season and the summer monsoon is warm and heavy with moisture. Option B is wrong because the westerlies, blowing from the sub-tropical highs towards the sub-polar lows, bring rain to the western margins of continents. Option C is wrong because the trade winds blow towards the equator and are warm and moist over the oceans. Exam tip: trades from the east near the equator, westerlies in the middle latitudes, easterlies again at the poles.