Discussion
Assertion (A) : Deflation basins are erosional features and may be upto several kilometers in diameter.
Reason (R) : Removal of sand particles by the wind is a cause of Deflation basin formation.
Which one of the following is correct ?
Answer: A
The answer is both (A) and (R) are true and (R) is the correct explanation of (A).
Assertion (A) is correct: deflation basins (blowouts) are erosional hollows in deserts, and they range from small dips to depressions many kilometres across. The Qattara Depression in Egypt, which reaches more than 130 m below sea level, is often cited as a large example in whose formation deflation played a part.
Reason (R) is the cause: deflation is the lifting and removal of loose sand and dust by the wind, which lowers the surface until the water table or a resistant layer is reached. Since (R) gives the process that makes the basins, it explains (A), so the other options are wrong.
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