I would suspect possibly some of these circles are computer generated images.
I have not seen many of these formations presented on this link, and I have seen thousands of circle photos.
Could be some missed circles here considering a sat. takes the images.
There are some interesting advertisement based circles as well that probably get little attention, as well as some beginner level circles.
They're not going to be computer generated since they're all satellite photos. The only computer generated images on Google Earth would be anything
that's purposely being hidden. Like military bases or Dick Cheney's house.
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