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A fault is distinguished from a joint by the presence of

  • A.mineral infilling in the fracture
  • B.water flowing along the fracture
  • C.displacement along the fracture
  • D.a curved rather than planar surface

Answer: C

Correct answer: displacement along the fracture

Both are fractures; the fault is the one along which the two sides have moved relative to each other. A joint may be open, mineral-filled or water-bearing and it is still a joint provided nothing has slipped along it. The distinction matters in practice: a fault carries crushed rock, a zone of weakness and often water, while a joint is a clean plane whose orientation and spacing govern block size.

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