Crop circles are usually not round, but slightly elliptical. In a real crop circle the plant's shafts/stalks (mostly wheat, but also grass, barley, canola, buckwheat, linseed, rice paddies, corn, sunflowers, blueberry bushes, trees, etc.) are bent around an inch above soil (corn stalks are bent a couple of inches above the soil) and the plants are laid in precise geometric swirl patterns with little signs of physical damage. There may be light burn marks at the base of stems, altered cellular structure and soil chemistry, increased magnetic particle deposits, discrepancies in background radiation, alteration of the local electromagnetic field, depletion of the local watershed, along with long-lasting energy patterns. Some analyzed crop circles have shown higher radiation levels. Crop circles range in size from a few inches to hundreds of feet across and have been as large as 200,000 sq. ft.
In real crop circle formations the stems are not broken but bent at 90° angles about an inch off the ground, at the plant's first node. The plants are subjected to a short and intense burst of heat or energy that softens the stems or stalks allowing them to be folded over onto the ground at a 90° angle. When the stems or stalks reharden into their new position, the plants and crop are not damaged and continue to grow. This is the method used to identify a real crop circle formation (agriglyph). The canola oil plant has a structure like celery. If the stalk is bent more than about 45°, the stalk will break. When crop circles are found in canola fields, the stalks are bent 90°. Research and laboratory tests suggest that microwave or ultrasound may be the only method capable of producing this effect, but plant biologists are still baffled by this phenomenon.
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