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Three of the following are recognised ice nucleating particles. Which is the odd one out?

  • A.mineral dust, especially feldspar
  • B.certain bacteria and biological fragments
  • C.volcanic ash particles
  • D.sodium chloride from sea spray

Answer: D

Sea salt is an excellent condensation nucleus but a poor ice nucleus, since it dissolves rather than presenting a lattice. The other three are all established sources of atmospheric ice nuclei. Solubility helps a condensation nucleus but hinders an ice nucleus.

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