Which method is not used to represent relief on a physical map?

In the context of representing relief on a physical map, the correct answer is based on the typical practices used in cartography. Relief, which refers to the variation in elevation and terrain features, is commonly illustrated through various methods like colors, shading, and contour lines.

Colors are often employed to indicate different elevations, with cooler hues representing lower areas and warmer shades depicting higher elevations. Shading techniques, such as shadowing or hill shading, provide a three-dimensional appearance, making it easier to visualize the landscape's contours. Contour lines, which connect points of equal elevation, offer a precise way to depict changes in relief and allow map readers to understand the slopes and heights of terrain.

In contrast, symbols primarily represent features like cities, roads, and landmarks rather than the physical characteristics of the land itself. While symbols can indicate different landscapes or vegetation types, they are not typically used to convey elevation or relief. Thus, it is this distinction that identifies the correct answer regarding methods not involved in illustrating relief on physical maps.