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An outlier is an area of

  • A.faulted rock surrounded by unfaulted rock
  • B.younger rock entirely surrounded by older rock
  • C.older rock entirely surrounded by younger rock
  • D.igneous rock surrounded by sedimentary rock

Answer: B

Correct answer: younger rock entirely surrounded by older rock

An outlier is a remnant of a formation left standing after erosion has removed the rest, so the younger rock survives as an island in the middle of older ground - typically capping a hill. Its opposite is an inlier, where erosion has cut through younger cover to expose older rock beneath.

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