Bahahaha. They are called contour lines! That's the scientific name.
Contour lines that touch or overlap on a topographic map indicate a
Contour lines that touch or overlap on a topographic map indicate a
Contour lines that touch or overlap on a topographic map indicate a
On a topographic map, contour lines that are closer together indicate a steeper slope.
an index contour.
Contour lines show elevation.
A map with contour lines is called a topographic map. These lines represent changes in elevation and help to visualize the shape of the terrain. Topographic maps are commonly used for hiking, surveying, and land navigation.
Contour lines show levels of elevation, where there are hills and valleys on a map
The scale of contour lines on a topographic (terrain) map is called the "contour interval".
The closer the contour lines, the steeper is the slope.
countour intervals
Closely spaced contour line on a topographic map shows that the land is steep.