How do you think the Nazca Lines in Peru were formed?
This is how the Nazca Lines were formed: The pebbles which cover the surface of the desert contain ferrous oxide. The exposure of centuries has given them a dark patina. When the gravel is removed, they contrast with the color underneath. In this way the lines were drawn as furrows of a lighter color, even though in some cases they became prints. In other cases, the stones defining the lines and drawings form small lateral humps of different sizes. Some drawings, especially the early ones, were made by removing the stones and gravel from their contours and in this way the figures stood out in high relief. Regards.
