Index lines are usually bolded and have the elevation as a numerical. Index lines show the current elevation every time it is shown. The closed contour lines indicate a mountain. Use the Nat Geo Topo Explorer website to find and display a contour map of your area. Also, it must be observed that the environmental contour lines obtained are quite different. An index contour line is shown after every five contour lines. Note: If you follow a single contour line, you walk at the same elevation all the way around until you return to your starting point. Index contour are bold lines that appear at every fifth contour line.Ī) Lines drawn on a map connecting points of equal elevation is the correct option.ī) Lines drawn on a map connecting points of unequal elevation is the wrong answer because contour lines are identical.Ĭ) Lines drawn connecting the Sun and the Earth are the wrong answers because they are not relevant to the contour lines.ĭ) None of the options is the wrong answer. Contour lines are useful because they depict the shape of land used by countless professions- foresters, hunters,miners,engineers etc.Īlso, Contour line, a line on a map reflecting an imaginary line on the surface of the ground, all points of which are at the same height above the data plane, typically mean sea level.Ī contour interval is the vertical distance in elevation between contour lines. For example, contours on an elevation have constant heights that are the same on each line.Ĭontour lines are lines drawn on a topographic map connecting points of equal elevation.They are also called “level- lines”. Unabridged Based on the Random House Unabridged Dictionary, Random House, Inc. 11) First recorded in 183545 Also called contour, level curve,level line.
the representation of such a line on a map. Contour lines join points of identical and constant values. A contour or a contour line may be defined as the line of intersection of a level surface with the surface of ground. noun a line joining points of equal elevation on a surface. Contour lines are critical to understanding the elevation status of a particular land formation.
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