How many types of Contour Lines are there?

Contour lines are an essential element in topographic maps, as they illustrate the terrain's elevation and slope. The correct response indicates that there are three distinct types of contour lines.

The three types include:

1. Index Contour Lines: These are the thicker lines on a map and are typically labeled with elevation values. They serve as reference points for understanding the elevation changes on the map more clearly.

2. Intermediate Contour Lines: These lines fall between the index contour lines and are thinner. They help to show the gradual changes in elevation between the index lines, providing a more detailed understanding of the terrain.

3. Depression Contour Lines: These depict areas of lower elevation, such as a crater or a depression in the landscape. They are typically marked with hachures or short lines that point toward lower elevation.

Understanding these distinctions is crucial for interpreting terrain features, planning navigation routes, and performing tasks that require knowledge of elevation and slope, which are vital in mountain warfare and other field operations.