you will see contour elevation numbers. This is the elevation of the contour line, relative to mean sea level. Contour lines that are relatively close together indicate a slope that is fairly steep.
Also called as the terrain is the variation that exists in the amount of the relief of the surface and difference is between the highest and lowest dimensions.
The relief can be shown of a topographic map and this represents the elevation for the vales reduced to the mean sea levels and thus shows the variations in height in terms of the contours on the land surfaces.
