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Assertion: the law of superposition establishes the age of any bed relative to its neighbours. Reason: sediment accumulates from the bottom upward.

  • A.both the assertion and the reason are true but the reason does not explain the assertion
  • B.both the assertion and the reason are false
  • C.the assertion is true only for an undisturbed sequence, though the reason is sound
  • D.both the assertion and the reason are true and the reason explains the assertion

Answer: C

Deposition does proceed upward, but folding can overturn a sequence so completely that the oldest bed lies at the top. The law holds only where the strata have not been inverted, which must be established independently.

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