Mystery of Amazonian Circles

Written By Mister Gu on Monday, March 2, 2015 | 1:55 PM


A range of earthworks scattered throughout the Bolivian and Brazilian Amazon, comprising square, straight and circular ditches, are being studied by archaeologists and environmentalists. Since the 1980s, deforestation has revealed massive earthworks in the form of ditches up to 16 feet (5 meters) deep, and often just as wide. Satellite images of the upper Amazon Basin taken since 1999 have
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