Crop circles are not only found in cereal fields: They were discovered in almost every type of vegetation.Especially since the 1990s to take crop circles in number, size, shape and detail. They usually have a diameter between 10 and 100 meters. Documents are polygonal, elliptical, interwoven, and fractal spiral form elements that combine in part with irregular formations. There is no observation of a natural origin of crop circles. It could be a signal of extraterrestrial activity, but also a warning.
More you can find in this book: Carl Sagan, 1996. The Demon-Haunted world: Science as a Candle in the Dark; "Aliens".
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