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Three of the following are examples of inadvertent weather modification. Which is the odd one out?

  • A.urban rainfall anomalies observed downwind of large cities
  • B.silver iodide released from a ground generator
  • C.ship tracks in marine stratocumulus
  • D.contrail cirrus from aircraft exhaust

Answer: B

Correct answer: silver iodide released from a ground generator

That is deliberate modification - the whole subject of the topic. The other three are unintended consequences of activity undertaken for other reasons: urban rainfall anomalies, ship tracks in marine stratocumulus, and contrail cirrus, each a real modification nobody set out to make.

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