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When the contour lines are farther apart, this means that the slopes between them are gentle. On the other side, if the contour interval is smaller, the slope will be steep.
No slope is undefined i.e. a vertical line slope of 0 is a horizontal line... i believe...
Contours for a gentle slope are spaced equally and far apart, the closer the contour lines the steeper the slope.
zero is horizontal, undefined is vertical
The run of a slope is the difference between x-coordinates (delta x or x2 - x1 ).