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Assertion (A): The western coasts of continents in the subtropics are often foggy and arid.
Reason (R): Upwelling of cold water cools the air, producing fog but suppressing convection.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives both effects, and the Atacama and Namib deserts both lie beside such an upwelling system. Fog supplies what little moisture reaches them, since the cold air is too stable to produce any rain.

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