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Two contour lines on a topographic map can never cross one another because that would mean

  • A.one point had two different elevations
  • B.the contour interval had been changed
  • C.the survey had used two separate datums
  • D.the map covered more than one sheet

Answer: A

A contour joins points of a single height, so an intersection would place two heights at the same position. The one apparent exception is an overhanging cliff, which is why such features are drawn with a special symbol instead.

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