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Most of the lines are formed by a shallow trench with a depth of between four inches (10cm) and six inches (15cm). They were made by removing the reddish-brown iron oxide-coated pebbles that cover the surface of the Nazca desert and exposing the light-coloured earth beneath
Well the modern day shaman say it way a test for the newly initiated. They were supposed to meditate and leave their bodies. If they could, they were then to fly above the lines and describe what they saw. Then they would be accepted as a new shaman.
originally posted by: Paperjacket
a reply to: cosmania
Because when those extraterrestrials visited the earth, our civilization was so poor and primitive so that they just could not hand over a CD to tell the natives where they were from. The only thing they could do was to leave something for the future humans who could understand their information and therefore they must build something 1. more permanent and 2. make sure we would understand it when the right time coming, e.g. when we could fly.