Question

the numerical difference between two contour line​

Answer 1

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Two contour lines next to one another are separated by a constant difference in elevation (e.g. 20 ft or 100 ft.). This difference between contour lines is called the $\sf\red{contour \:interval}$.

Answer 2

Two contour lines next to one another are separated by a constant difference in elevation (e.g. 20 ft or 100 ft.). This difference between contour lines is called the contour line ❣️