Discussion
Assertion (A): Tropical cyclones cannot form at the equator.
Reason (R): The planetary vorticity vanishes at the equator so there is nothing for convergence to amplify.
Select the correct answer from the options below.
Answer: B
Stretching amplifies the existing absolute vorticity, so with the planetary contribution zero and relative vorticity initially small there is nothing for the convergence to work on. The reason therefore explains the assertion. In practice storms require about five degrees of latitude, and the rare exceptions involve unusually strong pre-existing relative vorticity supplied by some other mechanism.
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