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Assertion (A): The environmental lapse rate is not the same thing as the adiabatic lapse rate.
Reason (R): One describes the observed temperature profile and the other the cooling of a rising parcel.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the distinction, and comparing the two is exactly how atmospheric stability is assessed. An environmental rate steeper than the adiabatic one means a rising parcel stays warmer than its surroundings and keeps rising.

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