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Supercooled fog at an airport can be cleared by

  • A.adding condensation nuclei to thicken it
  • B.cooling it further to below minus forty
  • C.waiting for the temperature to rise above zero
  • D.seeding it so that it glaciates and falls out

Answer: D

Seeding converts the droplets to ice crystals which grow and settle out, opening a hole. The technique is well established and is among the few uncontested successes of weather modification. The result is visible within minutes at the site.

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