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Dendritic crystals form most readily at around

  • A.minus 15 degrees Celsius
  • B.minus 2 degrees Celsius
  • C.minus 40 degrees Celsius
  • D.plus 2 degrees Celsius

Answer: A

Correct answer: minus 15 degrees Celsius

Around minus 15 the difference between the saturation vapour pressures over water and ice is near its maximum, so a crystal in a water-saturated cloud grows fastest there and does so along the branching, dendritic habit. That combination - rapid growth and a large capacitance from the branches - makes the dendritic growth zone the layer where most snow mass is produced.

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