On a USGS Topographic map, what do brown lines represent?

• A. Highways
• B. Contour lines
• C. State boundaries
• D. Woodland areas

Answer: (B)

Brown lines on a USGS Topographic map represent contour lines. These lines indicate elevation changes across the landscape and are essential for understanding the topography of an area. Each contour line connects points of equal elevation, allowing users to visualize the terrain's shape, such as hills, valleys, and slopes.

Contour lines are crucial for navigators and planners because they provide significant information about the steepness of terrain, enabling individuals to assess the difficulty of a route or plan for land use and construction projects. Understanding contour lines enhances the ability to read a topographic map effectively and gather important information about elevation changes that could impact search and rescue operations.