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The advantage of a graphic scale bar over a stated ratio is that it

  • A.indicates the date on which the survey was made
  • B.stays correct when the map is enlarged or reduced
  • C.shows which map projection was used for the sheet
  • D.removes the distortion introduced by projection

Answer: B

Photocopying or resizing a sheet changes every printed distance, so a stated ratio becomes wrong while a drawn bar shrinks or grows with the map and stays true. That is why bars are printed on maps intended to be reproduced.

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