Topographic maps use two more colors than road maps. White is used for _______ and reddish-brown is used for _________.

Topographic maps are designed to convey detailed information about the terrain and landscape features of an area. In this context, white on a topographic map typically represents areas that are void of vegetation, such as rocks, bare ground, or other surfaces that do not support plant life. This allows users to easily identify and understand landforms that might impact navigation or land use.

On the other hand, reddish-brown is used for man-made features, such as roads, as well as relief features like contour lines that outline the elevation changes in the area. Using reddish-brown helps differentiate these human-made and topographical elements from the natural aspects of the landscape, ensuring clarity in understanding the map.

Choosing the correct pairing of these colors is essential for accurately interpreting topographic maps, which provide vital information for outdoor activities, land management, and geographical studies.