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A fault is defined as a fracture in rock along which there has been

  • A.complete melting of the adjacent rock
  • B.a change in the chemical composition
  • C.relative displacement of the two sides
  • D.an increase in the density of the material

Answer: C

Correct answer: relative displacement of the two sides

A fracture alone is a joint; what makes it a fault is that the rock on one side has moved relative to the other. That displacement is the whole point, because it is the sudden slip on a fault that generates an earthquake. Melting, chemical change and density change may accompany deformation but none of them defines a fault.

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