Here's a breakdown:
* Contour lines are lines on a map that connect points of equal elevation. They show the shape and form of the terrain.
* They can be multiple lines that describe different elevations, not just the outside edge.
* They don't always describe the outside edge of an object. They can show the shape of a valley, hill, or even a flat plateau.
Imagine a mountain: You would have contour lines running around the mountain at different heights, showing its shape. The outermost contour line might represent the base of the mountain, but there would be many more contour lines inside, showing the mountain's slopes and peaks.
In summary, contour lines provide a comprehensive representation of the terrain's elevation changes, not just the outline of objects.
