A contour interval of 25 feet means that, between one contour and the next on a map, the ground rises (or falls) 25 feet. Contours closer together means that the slope is steeper, and contours further apart suggests a shallower incline.
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The Relationship between the relief of an area and the contour interval on a map of the area is A contour line
Contour interval
Most likely you says about contour interval. It's the difference in height between two sequential contour lines. For example, if the contour interval is 50 meters and some contour line corresponds 2000m above sea level, the next contour uphill was at 2050m then 2100m etc. Different maps use different intervals. It depends on map scale and terrain type (for mountain areas intervals are higher than for plains). The contour interval is shown on the map collar (typically near the scale).
Those lines representing elevation on a map are called contour lines. The difference in elevation between two of these lines is called the contour interval. Different maps use different contour intervals based on the scale of the map, or in other words, the size of the contour interval is based on how zoomed in and detailed the map is. Sometimes a map will have darker and thicker contour intervals. This is called the Index Contour Interval. Index contour intervals appear less frequently and represent a larger elevation change. It helps you figure out the amount of a large elevation difference faster because usually they are multiples of 100 or 1000, making them easier to add up.
A map of the Rocky Mountains would have a small contour interval because of the multiple peaks and ridges and the constant increase of elevation.