This article is from the Scientific Skepticism FAQ, by Paul Johnson Paul@treetop.demon.co.uk with numerous contributions by others.
This is a claim that has received wide circulation in UFO/cerealogy
circles (pardon the pun). It is also untrue. Examination of the data
from spectral analyses of soil taken from crop circles has shown that
there were no readings above the normal background levels. The
proponents of this claim are debating this, however.
 
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