Contour lines on standard US Geological Survey topographic maps are brown - e xcept on the surfaces of glaciers, where the contour lines are blue.(The short lines sticking out of the contour lines are called hachures, hatch marks, or tick marks.) Depressions that have no outlet are signified by closed contours with short lines that stick out of them and point toward the center.Circles that are closed contours generally signify hills.(However, in the rare case of a vertical cliff showing up on a topographic map, contour lines along the cliff may appear to join together into a single line.)
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