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

How can index contours be identified?

Index contours can be identified by every 5th contour line and also because its darker and heavier


What is labeled with the elevation in round units?

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I think it's an index contour, but I'm not sure.


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