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On a topographic map, elevation is shown using contour lines. These contour lines represent the elevation of the land at different points. Here's how they work:
1. Contour lines are lines that connect points of equal elevation. Each contour line on a map represents a specific elevation above sea level.
2. The spacing between contour lines, known as the contour interval, indicates the vertical distance between each line. For example, if the contour interval is 50 feet, each contour line represents a 50-foot change in elevation.
3. Index contours are thicker contour lines that usually have elevation labels. These lines help you quickly identify the elevation at various points on the map.
4. Intermediate contours are thinner lines that occur between the index contours. They provide more detail about the terrain and help you visualize the slope of the land.
By understanding how contour lines work on a topographic map, you can interpret elevation changes, identify valleys, hills, and other landforms, and navigate the terrain more effectively.
