Contour lines that touch or overlap on a topographic map indicate a a. depression b. tall mountain c. vertical cliff d. valley

Contour lines represent altitute of topographical features on a map. If a contour line (of, say, 400 feet) overlaps with another countour line (of, say, 200 feet), then it is a vertical cliff. A depression, valley, and tall mountain would all have contour lines between the values or space between the contour lines

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