Depression contours on a map are shown by which feature?

Depression contours on a map are shown by which feature?

• A. Closed contours with right angle tick marks pointing inward
• B. Hatched blue lines
• C. Thick brown lines with elevations
• D. Solid red lines

Answer: (A)

Depression contours are shown by closed contour lines that include short tick marks (hachures) pointing inward toward the center of the loop. Those inward ticks indicate that elevation decreases as you move toward the center, identifying a hollow or basin rather than a rise. The lines themselves form a loop to enclose the feature, and the ticks distinguish a depression from a hill, which wouldn’t have inward-pointing ticks. Other map features like hatched blue lines indicate marshy areas, thick brown lines with elevations are standard contour lines without the depression marker, and solid red lines typically represent boundaries or roads, not depressions.