Cloud seeding introduces tiny particles, often silver iodide, into clouds that already contain moisture, giving water vapor a surface to condense around more readily than it would on its own. The method cannot create rain from a clear sky; it can only coax a bit more precipitation from clouds already primed to produce some. Studies estimate the gain at perhaps ten to fifteen percent above what would have fallen anyway, a modest number that is nonetheless significant to a region managing a reservoir during a multi-year drought, where every additional percentage point of runoff has a measurable effect on water supply.
The author's primary purpose in this passage is to
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Correct answer to question 92 (Paragraph Comprehension): clarify what cloud seeding can and cannot realistically accomplish
Method
The passage corrects the assumption that seeding creates rain from nothing, explains the modest percentage gain, and ties that gain to drought management, which together clarify what the method can and cannot do.
Updated: November 2026
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