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The dry adiabatic lapse rate is approximately

  • A.9.8 degrees Celsius per kilometre
  • B.6.5 degrees Celsius per kilometre
  • C.3.4 degrees Celsius per kilometre
  • D.0.98 degrees Celsius per kilometre

Answer: A

A parcel of dry air rising without exchanging heat with its surroundings cools at this rate as it expands. Comparing it with the actual environmental lapse rate is what tells you whether the atmosphere is stable or unstable.

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