"Another interesting element is the nature of the soil on which the circles appear. Pringle says that 93.8 per cent of crop circles are made on chalk, "a worldwide phenomenon" recorded in 54 different countries. She says the significance may be connected to underground springs called aquifers commonly found in chalk: "It is thought that the originating force probably originates in the ionosphere (an area of atmospheric electricity). The force then spirals to earth in the form of a vortical plasma and hits the ground with some 100 of 1000's of volts per metre for just a nano second only, else the crop would be burnt. Occasionally we do see evidence of scorched flattened crop inside certain circles. The electromagnetic fields of both the underground springs and the descending force work in harmony or conjunction with each other."
Is there anything in this, or is it more hoaxers a la Doug and Dave?
http://www.independent.co.uk/news/uk/th ... 82647.html
See also, Schumann resonances and brain wave frequencies
http://en.wikipedia.org/wiki/Schumann_resonances
http://hypertextbook.com/facts/2004/Sam ... rles.shtml