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Permeability differs from porosity in measuring the rock's ability to

  • A.transmit water through its voids
  • B.hold water within its voids
  • C.retain water against gravity
  • D.dissolve away in the circulating water

Answer: A

Transmission requires the voids to be interconnected and large enough for flow, which is why clay is porous but nearly impermeable. It is permeability rather than porosity that decides whether a formation is an aquifer.

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