Question

what is a contour interval?
a. the degree of a slopes steepness
b. a loop formed by contour lines that indicates a peak or depression
c. the elevation difference between two adjacent contour lines
d. an imaginary line that joins points of equal elevation

Explanation:

A contour interval is defined as the vertical distance or elevation difference between two adjacent contour lines on a topographic map. Option A describes slope steepness, option B is about a contour - line loop, and option D is the definition of a contour line, not a contour interval.

Answer:

C. the elevation difference between two adjacent contour lines