What is the difference in evevation between two successive index contours on a map with a contour on a map a contour interval of 5 m

On topographic maps, elevation is shown by using contour lines. The difference in elevation between one contour line and the next is called the contour interval. The contour interval is selected based on the relief of the area being mapped. Every fifth contour line is darker than the four lines one either side of it.

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