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Fault-block mountains are formed by extensional stresses.

Explanation:

  • Fault-block mountains are formed because of extensional stresses. They are also called tension stresses.
  • These stresses pulls and stretches rocks apart which causes normal faults to form.
  • The normal fault cuts through rocks, causing one to slip downward and one to move upward. Thus, fault-block mountains are formed.
  • Sierra Nevada in California and Nevada is an example of a fault-block mountain.

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