Crop circles are complicated geometric patterns, usually in wheat fields. Some people belive that the patterns are left by the imprint of an extra-terrestrial craft, or that they are a message from extra terrestrials themselves. Another theory is that natural forces such as tornadoes, heat or strong winds create the patterns by flattering the crops, but the regular shapes of most crop circles makes this unlikely.
The most likely explanation is that the circles are made by people as a hoax. They gradually build up a design by flattering the wheat, using very basic equipment such as rope and planks of wood.
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