| http://www.w3.org/ns/prov#value | - The bottom of the hollow is lower than the lowest closed contour. 4) Contours are widely spaced on gentle slopes. 5) Contours are closely spaced on steep slopes. 6) Evenly spaced contours indicate a uniform slope. 7) Contours do not cross or intersect each other, except in the rare case of an overhanging cliff. 8) All contours eventually close, either on a map or beyond its margins. 9) A single hi
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