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A graben is a block that has been

  • A.displaced horizontally between two faults
  • B.folded between two anticlines
  • C.downthrown between two normal faults
  • D.upthrown between two normal faults

Answer: C

Correct answer: downthrown between two normal faults

A graben is a block dropped between two normal faults dipping towards each other, so it forms a trough. Grabens record extension and are the structural basis of rift valleys - the East African Rift and the Rhine Graben among them. The complementary structure, a block left standing high between two normal faults dipping away from each other, is a horst.

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