Question

what is contour lines​

Answer 1

a line on a map joining points of equal height above or below sea level

Answer 2

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. A contour line of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane ...





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