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Geophysics investigates the subsurface by measuring

  • A.the chemical composition of surface samples
  • B.the fossil content of exposed strata
  • C.the mineral content of drill cores
  • D.physical properties such as seismic velocity and resistivity

Answer: D

Seismic, electrical, gravity and magnetic methods infer what lies below without excavating it, which is why they are used to plan where the boreholes should go. They give continuity between boreholes rather than replacing them.

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