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The Hallett Mossop process produces secondary ice through

  • A.the direct deposition of vapour onto bare ice nuclei
  • B.the collision of two comparatively large ice crystals
  • C.the melting and subsequent refreezing of snowflakes
  • D.splinters ejected during the riming of supercooled droplets

Answer: D

Correct answer: splinters ejected during the riming of supercooled droplets

In the Hallett–Mossop process a supercooled droplet freezes onto a rimer, and the freezing shell traps liquid that expands and ejects small splinters. Each splinter is a new ice crystal, so the process is a multiplier. It operates in a narrow window between about minus 3 and minus 8 degrees and requires droplets of both large and small sizes to be present, which is why it dominates in some clouds and not others.

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