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Discussion

Hail grows in alternating clear and opaque layers because

  • A.wet and dry growth regimes alternate as it circulates
  • B.the stone melts and refreezes repeatedly
  • C.different aerosol particles are collected in turn
  • D.the stone changes its rotation direction periodically

Answer: A

Wet growth traps water that freezes slowly and clearly, while dry growth traps air and appears opaque. Sectioning a stone therefore reveals something of its history within the storm. The layering is a record of the trajectory it followed.

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