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Comparing geophysical survey with boreholes for site investigation, geophysics

  • A.replaces boreholes entirely on most sites
  • B.gives direct samples of the rock at depth
  • C.measures rock strength directly
  • D.gives continuity between boreholes rather than replacing them

Answer: D

It maps a physical property continuously across a site, which interpolates between the points where boreholes gave hard information. Neither alone is sufficient: the boreholes calibrate the geophysics and the geophysics extends the boreholes.

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