How is the height distance between contour lines stated?

The height distance between contour lines is referred to as the contour interval. This term is used in cartography to describe the vertical distance or difference in elevation between adjacent contour lines on a map. Each contour line represents a specific elevation level, and the contour interval indicates how much elevation changes between each line. This is crucial for understanding terrain, as it helps users to visualize the steepness or flatness of the landscape depicted on the map.

The contour interval is essential for interpreting topographic maps accurately, as it provides a clear reference for elevation changes over distances. Without knowing the contour interval, one would struggle to gauge how steep or gentle the slopes of the terrain are.

Other options, while they may relate to elevation or distance, do not specifically define the height difference between contour lines. Therefore, the choice of contour interval is accurate because it succinctly and clearly describes the measurable vertical difference between these lines on a map.