Aclosed circle with short lines inside on a topographical map
a)relief
b)depression
c)elevation
d)topographic map
e)contour interval
f)index contour

The correct answer is E. Contour interval

Explanation:

In a topographical map it is common to find different symbols to represent topographical features, in the case of contour interval this term refers to the difference in the elevation between two lines in a topographical map that aims at representing by large-scale detail the relief of a geographical zone, it means contour lines represent by curved lines in the map aim at showing how the elevation varies in a specific zone. In the case of contour interval, it refers to the difference in elevation between a set of contour lines and considering these are represented as curved lines, the general contour interval is usually represented with a close circle with short lines inside. Thus, a close circle with short lines inside is used to represent the contour interval.

c. a group of tribes that formed a confederacy