Discussion
At any given time, there are an estimated ........... thunderstorms in progress over the globe.
Answer: D
An estimated 2,000 thunderstorms are in progress at any given time.
The widely quoted estimate, based on early global surveys, is about 1,800-2,000 thunderstorms active at any moment, adding up to some 16 million a year. They are concentrated over tropical land, and together they produce lightning about 40-50 times per second worldwide and maintain the global electric circuit.
50,000, 30,000 and 20,000 are far too high for storms active at one moment; figures of that order describe the number of thunderstorms over a day or so, not at any given instant.
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