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Which of these best describes what liquefaction does to a soil deposit?

  • A.It removes the water from the pores and leaves the deposit dry and loose
  • B.It increases the strength of the deposit for the duration of the shaking
  • C.It temporarily turns a solid into something behaving as a liquid
  • D.It permanently converts the sand particles into a chemically different material

Answer: C

For a period of seconds to minutes the deposit has no effective stress and no frictional strength, which is why buildings sink and buried tanks float. It regains strength as the pressure dissipates, leaving a denser and lower ground surface.

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