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An isoline joins points of

  • A.equal population within the region
  • B.equal elevation above mean sea level
  • C.equal value of the mapped quantity
  • D.equal distance from a chosen centre

Answer: C

Contours are the familiar case, joining points of equal height, but the same construction serves temperature, pressure and rainfall. Restricting the idea to elevation alone is a common but avoidable narrowing of the term.

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