Question

What are contours ?​

Answer 1

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

Answer 2

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A contour is a line on a map joining of two points of equal height, and is the standard method of showing relief on a topographical map.