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the change in elevation between adjacent contour lines
a line connecting points of equal elevation on a map
a contour line with hachure marks to indicate a depression or hollow
the height of a location abbove a fixed reference point, usually sea level
the slope of a surface or line
the contour line that includes an elevation label
the difference in elevation between the highest and lowest points in a landscape
a map that uses contour lines to depict variations in elevation across a landscape