If a map is designed to show how elevation changes across a region using contour lines, what must be done with the graphical scale?

Question

Accepted Answer

It helps provide a visual reference for measuring distances on the ground surface, assuming the contour interval is known.. The graphical scale provides a direct visual measure of distance. When used with contour lines, it helps ground the measurement process by providing a reference for how far apart features are on the map surface relative to reality.