Discovery Construction and Purpose of Nazca Lines

After people traveled over the area by plane in the 1930s and saw the Nazca Lines from the air, anthropologists started studying them, with focus on trying to understand how they were created.
Scholars have theorized the Nazca people could have used simple tools and surveying equipment to construct the lines. Studies have found wooden stakes in the ground at the end of some lines, which support this theory. One such stake was carbon-dated and the basis for establishing the age of the design complex. Researcher Joe Nickell of the University of Kentucky has reproduced the figures by using tools and technology available to the Nazca people. The National Geographic called his work "remarkable in its exactness" when compared to the actual lines. With careful planning and simple technologies, a small team of people could recreate even the largest figures within days, without any aerial assistance. Most of the lines form a trench about 15 centimetres (5.9 in) deep.
The lines were made by removing the reddish-brown iron oxide-coated pebbles that cover the surface of the Nazca desert. When the gravel is removed, it leaves a shallow trough ranging from 10 centimetres (3.9 in) to 15 centimetres (5.9 in) deep and the light-colored earth beneath shows in lines of sharply contrasting color and tone. This sublayer contains high amounts of lime which with the morning mist hardens forming a protective layer that shields the lines from winds therefore preventing erosion.
The Nazca "drew" several hundred simple but huge curvilinear animal and human figures by this technique. In total, the earthwork project is huge and complex: the area encompassing the lines is nearly 500 square kilometres (190 sq mi), and the largest figures can span nearly 270 metres (890 ft). The extremely dry, windless, and constant climate of the Nazca region has preserved the lines well. The Nazca desert is one of the driest on Earth and maintains a temperature around 25 °C (77 °F) all year round. The lack of wind has helped keep the lines uncovered and visible to the present day.

Archeologists, ethnologists and anthropologists have studied the ancient Nazca culture and the complex to try to determine the purpose of the lines and figures. One theory is that the Nazca people created them to be seen by their gods in the sky. Kosok and Reiche advanced a purpose related to astronomy and cosmology: the lines were intended to act as a kind of observatory, to point to the places on the distant horizon where the sun and other celestial bodies rose or set. Many prehistoric indigenous cultures in the Americas and elsewhere constructed earthworks that combined such astronomical sighting with their religious cosmology, as did the later Mississippian culture at Cahokia in present-day United States. Another example is Stonehenge in England. But, Gerald Hawkins and Anthony Aveni, experts in archaeoastronomy, concluded in 1990 that there was insufficient evidence to support such an astronomical explanation.
In 1985, the archaeologist Johan Reinhard published archaeological, ethnographic, and historical data demonstrating that worship of mountains and other water sources predominated in Nazca religion and economy from ancient to recent times. He theorized that the lines and figures were part of religious practices involving the worship of deities associated with the availability of water, which directly related to the success and productivity of crops. He interpreted the lines as sacred paths leading to places where these deities could be worshiped. The figures were symbols representing animals and objects meant to invoke the gods' aid in supplying water. But, the precise meanings of many of the individual geoglyphs remain unsolved as of 2011.
Henri Stierlin, a Swiss art historian specializing in Egypt and the Middle East, published a book in 1983 linking the Nazca Lines to the production of ancient textiles that archeologists have found wrapping mummies of the Paracas culture. He contended that the people may have used the lines and trapezes as giant, primitive looms to fabricate the extremely long strings and wide pieces of textile that are typical of the area. By his theory, the figurative patterns (smaller and less common) were meant only for ritualistic purposes.