Question

The contour interval of a topographic map is 25 feet. How many contour lines will be drawn between sea level and an elevation of 150 feet?

A) 4
B) 5
C) 6

Answer 1

C) 6

Sea level is 0 feet, so if the contour interval is 25 feet, all you have to do is 150 divided by 25. This gives you 6 contour lines.