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Question: Liquefaction occurs when:

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  1.  water from a seiche washes away soil.
  2.  flooding occurs as a secondary effect of an earthquake.
  3.  ground motion causes loose, sandy soil to act like a fluid
  4.  rivers are created at fault lines.

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3. Ground motion causes loose, sandy soil to act like a fluid

Liquefaction occurs when ground motion causes loose, sandy soil to act like a fluid.

liquefaction

(Snapshot taken from https://www.usgs.gov/faqs/what-liquefaction)

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