SOLAR SYSTEM

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 line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines.

Detailed explanation-3: -Contour lines, or lines which connect points of equal elevation, are drawn on a topographical map in order to quantify the elevation at any point on the map.

Detailed explanation-4: -For a quick definition, a contour line joins points of equal and constant values. For example, contours on an elevation have constant heights that are the same on each line in a topographic map.