UPSC Prelims 2011·GS1·geography·climatology

What could be the main reason/reasons for the formation of African and Eurasian desert belt? 1. It is located in the sub-tropical high pressure cells. 2. It is under the influence of warm ocean currents. Which of the statements given above is/are correct in this context?

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  1. A1 onlyCorrect
  2. B2 only
  3. CBoth 1 and 2
  4. DNeither 1 nor 2

Explanation

The correct answer is A because of the following reasons: Statement 1 is correct. The African and Eurasian desert belt, which includes the Sahara and the Arabian deserts, is located between 20 to 30 degrees North latitude. This region is dominated by sub-tropical high pressure cells where air descends. Descending air is compressed and warms up, which inhibits cloud formation and precipitation, leading to arid conditions. Statement 2 is incorrect. Deserts on the western coasts of continents are generally influenced by cold ocean currents, not warm ones. Cold currents cool the air and reduce its capacity to hold moisture, which creates stable atmospheric conditions that prevent rain. Warm ocean currents generally bring moisture and rain to coastal areas, which would prevent the formation of a desert.
geography: What could be the main reason/reasons for the formation of African and Eurasian desert belt? 1. It is located in the sub

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