What describes the height distance between contour lines on a map?

The term that describes the height distance between contour lines on a map is known as the contour interval. This metric indicates the difference in elevation between adjacent contour lines, allowing individuals to understand the terrain's slope and elevation changes. A smaller contour interval represents more detailed elevation changes, while a larger interval may simplify the topographic features, making it easier to read less complex terrain features. This concept is essential for map reading and navigation in both military and civilian contexts, as it directly impacts how one perceives and navigates through the landscape depicted on the map.