Discussion
Corona discharge from vegetation during a storm
Answer: B
Correct answer: carries a current between the ground and the air
Corona from grass, trees and crops in the strong field beneath a storm passes a small current continuously from the ground into the air, and integrated over the area beneath a storm it forms a significant part of the electrical budget of the global circuit. It occurs before and during the storm rather than after a strike, and it does not prevent lightning - it merely bleeds off a fraction of the charge.
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