Question

Study the topographic map.

A topographic map. Two thick red lines go through areas with index contour lines with numbers 450 and 500. A thin black line with hashes goes through areas with index contour lines with number 450.

Which value is a good estimate of the railroad’s average elevation?

450
480
500
550

Answer 1

480

The railroad lies between the 450 and 500 index contours (contour interval 50) and stays between them, so its average elevation is about midway — roughly 480 ft.