What type of information does a contour line represent on a map?

Contour lines on a map are used to represent changes in elevation. Each line connects points of equal elevation, indicating the height of the terrain above a base level, usually sea level. When contour lines are close together, they signify steep terrain, while lines that are spaced further apart indicate a gentler slope. This representation is crucial for understanding the topography of an area, as it helps navigators determine elevation changes that can impact travel and movement. The information provided by contour lines is essential for various activities, including hiking, land development, and military maneuvers, allowing for effective planning and navigation in the field.