Discussion
A plume that reaches the ground in a fumigation event does so because
Answer: B
Correct answer: The inversion beneath it erodes
Fumigation happens when the ground warms in the morning and the overnight inversion is eaten away from below. The plume, which had been trapped and concentrated above it, is suddenly mixed down to the surface in a body - giving the highest short-term ground-level concentrations of any plume type, and often lasting only half an hour.
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