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 have small ticks (hachures) on the inside, pointing toward the center. Those inward tick marks signal that elevation decreases as you move toward the center, marking a hollow or pit. This is what distinguishes a depression from a hill, where a closed loop would encircle higher ground and lack inward ticks. Other features don’t indicate depressions: blue hatch lines are typically used for marshy or watery areas, thick brown lines with elevations are just standard contour lines showing height, and solid red lines are political boundaries. So the closed loops with inward-pointing ticks best represent a depression on a map.

Depression contours are shown by closed contour lines that have small ticks (hachures) on the inside, pointing toward the center. Those inward tick marks signal that elevation decreases as you move toward the center, marking a hollow or pit. This is what distinguishes a depression from a hill, where a closed loop would encircle higher ground and lack inward ticks. Other features don’t indicate depressions: blue hatch lines are typically used for marshy or watery areas, thick brown lines with elevations are just standard contour lines showing height, and solid red lines are political boundaries. So the closed loops with inward-pointing ticks best represent a depression on a map.