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Assertion (A): The fair weather field over the ocean varies with universal rather than local time.
Reason (R): It responds to global thunderstorm activity rather than to conditions locally.

  • 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

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the cause. The fair weather field is maintained by the world’s thunderstorms acting as a global generator, so it peaks when the total global thunderstorm activity peaks - at about 1900 universal time, when the storms over the Americas are most active. Over the ocean, away from local sources of variation, that global signal is what is measured. It is called the Carnegie curve.

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