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Sea salt aerosol assists warm rain formation particularly because

  • A.some particles are large enough to become collectors immediately
  • B.it lowers the surface tension of the droplets formed
  • C.it lifts the humidity in the sub-cloud layer
  • D.it prevents smaller particles from activating

Answer: A

Salt particles of several micrometres produce droplets already past the collection threshold at cloud base. Concentrations of only a few per litre can measurably shorten the time to first rain. Their rarity is offset by how quickly they begin collecting.

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