Question

what is the contour interval on the topographic map above? 5 m 40 m 10 m 20 m

Explanation:

Step1: Identify contour - line values

The contour - line values given are 200, 220, 240.

Step2: Calculate the difference

Subtract the lower value from the higher value. $220 - 200=20$ and $240 - 220 = 20$. The difference between consecutive contour - line values is 20. This difference is the contour interval.

Answer:

20 m