What a contour interval on a topographic map

A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.

As given below.

Explanation:

A contour line that is drawn on the contour map to indicate the places of high and lower latitudes. As far as the contour line is spearheaded the leas in the steepness and as close, the lines are more is the steepness indicating the presence of the gorge or a hilly platform. The intervals can be like 200-400-600-800-1000 and so on. or maybe vis Versa.

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