A contour line indicates height.
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A contour line that is bold and labeled is called an index contour line. These lines help to easily identify specific elevations on a topographic map.
The horizontal lines on a map or globe that indicate distance north or south of the Equator.
Each contour line represents a rise in height (elevation). The closer the contour lines are on the map, the steeper is the slope.
A contour line on a topographic map is typically labeled with the elevation in round units. This helps to indicate the elevation of the land and the change in elevation across the map.
It depends on the kind of map you're looking at. On a weather map green means rain. On an elevation map green can represent low level of elevation. On an area map green can represent forests, parks, golf courses, or unusual things once in a while.