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Geophysical methods are best regarded as a means of

  • A.obtaining undisturbed samples of the ground at depth
  • B.measuring the ground's strength directly and reliably
  • C.interpolating between boreholes rather than replacing them
  • D.replacing boreholes entirely on most project sites

Answer: C

They map a physical property continuously, but the property must be calibrated against something actually seen in a hole. Boreholes give certainty at points and geophysics gives continuity between them; neither alone suffices.

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