Discussion
Assertion (A): A fanning plume can produce a sudden high concentration far from its source.
Reason (R): It travels for great distances almost undiluted within a stable layer.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
In a stable layer the plume spreads sideways but not vertically, so it travels a long way almost undiluted. If the layer later breaks up - as it does when the ground warms - that concentrated ribbon is mixed down in one body, which is exactly how a fanning plume produces a sudden high concentration far from its source.
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