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Silver iodide begins to nucleate ice at a temperature of approximately

  • A.minus 40 degrees Celsius
  • B.plus 5 degrees Celsius
  • C.minus 25 degrees Celsius
  • D.minus 5 degrees Celsius

Answer: D

Reported thresholds cluster between about minus four and minus eight depending on preparation. Nucleating at so modest a supercooling is precisely what makes the compound useful for seeding. Most natural mineral nuclei require far deeper supercooling.

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