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by David Parker - © Corbis. All Rights Reserved. - © David Parker/Science Photo Library/Corbis
Aerial view of a crop formation near Barbury Castle
23 Aug 1991, Wiltshire, England, UK --- Aerial view of a crop formation near Barbury Castle, Wiltshire, England. Crop formations are patterns of flattened plants in crops such as wheat or barley. They started appearing frequently in the mid-1980s in south-west England. Their cause is unknown. Many theories exist, ranging from science-based physical explanations such as the 'plasma vortex' theory based on the phenomenon of electrohydrodynamics (EHD) to suggestions that they are created by alien intelligences. This formation was photographed a few weeks after it appearared & shows typical signs of damage as a result of people tramping around it. Normal rain damage to the crop can also be seen. --- Image by © David Parker/Science Photo Library/Corbis
