GENERAL KNOWLEDGE

Detailed explanation-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.

Detailed explanation-2: -A contour is an imaginary line that connects points of equal elevation. A contour line may represent a visible line such as a lake shoreline, but usually contours are sketched between and around points of known elevations, as shown in the graphic.

Detailed explanation-3: -A contour is an imaginary line that connects points of equal value. A contour map, also known as an isoline map, typically shows multiple contours such as elevation or temperature contours. This contour map shows elevation contours. Hills are steeper where the contours are closer together.