What element of a topographic map helps to determine the steepness of terrain?

• A. Map scale
• B. Contour interval
• C. Grid references
• D. Legend

Answer: (B)

The contour interval on a topographic map is key for determining the steepness of terrain. Contour lines represent elevation and show the shape and features of the land. The contour interval is the vertical distance or difference in elevation between successive contour lines. A smaller contour interval means that the elevation changes are subtle, indicating a gentler slope. Conversely, a larger contour interval means that elevation changes are more pronounced, which indicates steeper terrain.

By examining how closely the contour lines are spaced, one can gauge the steepness of the slope. Where the lines are close together, the terrain is steep, while areas where the lines are spaced further apart indicate flatter ground. This relationship allows users to assess the topography efficiently, making the contour interval a critical element for understanding the landscape on a topographic map.

Map scale provides a sense of distance but does not inform about the steepness directly. Grid references assist in locating positions on the map, while the legend explains symbols and features but does not provide information on terrain steepness.