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A rock slope is most liable to slide when a joint or bedding plane dips

  • A.out of the face at less than the face angle
  • B.into the face at any angle
  • C.parallel to the face exactly
  • D.vertically within the face

Answer: A

A plane daylighting in the face with a dip shallower than the slope provides a ready surface for a block to slide on. The same plane dipping into the face is harmless, which is why orientation matters more than strength.

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