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Contour lines on aeronautical maps and charts connect points..
  • A
    with the same variation.
  • B
    having the same elevation.
  • C
    of equal latitude.
  • D
    having the same longitude.

Refer to figure.
Contour lines are drawn connecting places at the same elevation above mean sea level (MSL). They can indicate gradient as well as height. The closer the lines are together on the chart, the steeper the terrain. Contour lines widely apart from each other indicate a shallow sloping terrain.

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