crop circle
Also known as corn circle, crop formation
pattern in a crop field
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Aerial view of crop circles in Switzerland
A crop circle, crop formation, or corn circle is a pattern created by flattening a crop, usually a cereal. The term was coined in the early 1980s. Crop circles have been described as all falling "within the range of the sort of thing done in hoaxes" by Taner Edis, professor of physics at Truman State University.