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Mineral dust is an effective ice nucleating particle chiefly because

  • A.it is present in very large numbers everywhere
  • B.its crystal lattice resembles that of ice
  • C.it dissolves readily in supercooled water
  • D.its temperature exceeds that of nearby droplets

Answer: B

A lattice match lowers the energy barrier to forming an ice embryo on the surface. Feldspar in particular is among the most efficient natural ice nucleating minerals known. Desert dust outbreaks can therefore alter cloud phase downwind.

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