what are contour lines
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Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. Numbers on the lines give the height in feet. (Sea level is zero.) Lines drawn closely together indicate that a slope is steep.
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contour line is a line on a map representing am imaginary line on land surface,all points which are at same elevation above a datum plane.
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