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Index contours are typically marked by bold lines and indicate specific elevation levels on a topographic map. By observing the spacing between these index contours, you can determine if the land is increasing or decreasing in elevation; closely spaced contours indicate steep terrain, while widely spaced contours suggest a gentle slope. If the index contours are ascending in elevation as you move in a particular direction, the land is increasing in height; conversely, if they descend, the land is decreasing in elevation.

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1w ago

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How do index contours let you know if the land you are viewing is increasingor decreasing in elevation?

Index contours are thicker and usually labeled with their elevation. By identifying the index contours on a topographic map, you can determine if the land is increasing or decreasing in elevation. If the index contours are closer together, the land is steep, indicating a rapid change in elevation. Conversely, if the index contours are further apart, the land is gradually increasing or decreasing in elevation.


How do index contours let you know if the land you are viewing are increasing or decreasing?

Each index contour has an elevation associated with it. When you look at 2 contours, one will have a higher corresponding elevation. As you go from the lower elevation to the higher elevation, you know that the land is increasing in the direction toward the higher elevation. From the higher to the lower elevation, the land is decreasing (sloping downward, decreasing in elevation).


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