In topographic maps, why is a gentle slope characterized by contour lines spread widely apart?
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A contour line represents a fixed change in value. With elevation contours the change in value is elevation or height- for example 20 foot contours. If the slope is Rise/Run, the longer the RUN (ie distance between contours) the less the slope. Because the rise never changes (fixed contour intervals) the distance between contours represents the steepness of the slope. For Cliffs and very steep inclines the contours come together because there is little to no RUN.
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