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

Option (B)

Explanation:

Depressions or basins are generally shown in the map in the form of small closed circles whose elevation is the minimum. Within these closed circles are the hatched lines and the height of the contour lines that surrounds these circles are in increasing order.

In a topographic map, these basins are easily identified by observing the orientation of these hatched lines within the closed circles. If these hatched lines are present inside the circle then it depicts a basin and if these hatched lines are outside the circle then it depicts a hill.

Thus the correct answer is option (B)