For thousands of years, areas along the north coast of Peru have been subject to huge flooding as a result of El Niño, a periodic warming in the atmosphere of the Pacific Ocean, which causes torrential rainfall in the eastern Pacific. El Niño events are unpredictable, occurring anywhere from every 6-7 years to every 10-20 years, and are generally seen as a disruptive force, but recent archaeological work in the Pampa de Mocan, a coastal desert plain in northern Peru, indicates that this was not always the case.
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