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Three of the following are glaciogenic seeding agents. Which is the odd one out?

  • A.solid carbon dioxide dropped as pellets
  • B.liquid propane expanded through a nozzle
  • C.coarse sodium chloride powder
  • D.silver iodide released from a flare

Answer: C

Correct answer: coarse sodium chloride powder

Salt is hygroscopic: it attracts water and grows into a large droplet, which is warm rain seeding and works in clouds above freezing. The other three are glaciogenic, producing ice in supercooled cloud - silver iodide by nucleation, dry ice and propane by cooling.

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