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Folds are produced principally by

  • A.compressive stress
  • B.tensile stress
  • C.shear stress alone
  • D.the release of confining pressure

Answer: A

Shortening the rock mass forces the layers to buckle, which is why fold belts mark former convergent margins. Tension produces normal faulting and jointing instead, so the structure records the stress regime that made it.

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