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Yes it is because they must have the same distance between them to be considered contour
The difference in elevation between the highest and lowest contour lines on a topographical map is called a contour interval.
Contour numbers.
the steepness of an area
contour intervals
the contour interval
It is inversely proportional to the gradient: the steeper the slope the closer the contour lines until there comes a point where the ground is so steep the lines merge into one.
You know, when contour lines are closer together on a map, they indicate a steep slope. Just think of contour lines as the distance between each incline. The closer together the inclines, the steeper the hill.
Contour lines are lines that join up points on a map that represent points on Earth's surface that have equal height. The distance between the contour lines gives an indication of how much the height changes over a horizontal distance. In other words it shows you how steep or gentle the slope is.As such a steep slope will be marked by closely spaced contour lines and a more gentle slope will have more widely spaced contour lines.
The distance in height between contour lines should be stated in the map's legend. If the contours are stated in the legend as being 50 metres apart, then count the lines upwards from a contour that has a height against it, and multiply by the number of unlabelled lines.
They show the relief of an area. They will have height values attached to them. The distance between contour lines gives an impression of gradient. The closer they are together, the steeper the slope.
One of the characteristics of contour is that the variation of the vertical distance between any of the two contour lines are usually assumed to be uniform. The other characteristic is that all the points on a contour line are of the same elevation.