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Gr 4-6 Using straightforward language, Oxlade examines the variety of designs and theories connected with the strange, beautiful, and harmless phenomena called crop circles, circular patterns that inexplicably appear in crop fields. While most recent formations have been admitted hoaxes or works of art, the older, simpler ones are attributed to natural occurrences such as electrically charged air currents, wind vortices, and underground magnetic or electromagnetic forces...Log In or Sign Up to Read More