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A gravity survey detects subsurface features through their contrast in

  • A.magnetic susceptibility of the minerals present
  • B.density
  • C.seismic wave velocity through the material
  • D.electrical conductivity of the pore fluid

Answer: B

Correct answer: density

A gravity survey measures very small variations in the earth’s gravitational field caused by density contrasts at depth. A cavity or a buried valley filled with soft deposits shows as a negative anomaly, a dense intrusion as a positive one. It is the method of choice for detecting voids in limestone, where nothing else works over large areas.

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