On Wed, Apr 27, 2011 at 12:40 AM, Kim Holburn <kim at holburn.net> wrote: > They are irrigation circles. > http://www.traxcoirrigation.com/growing-crops-in-libya-center-pivot-systems Kim, look at the picture again, those seem to be rocks. (in the first picture from the set, at least) http://wiki.answers.com/Q/What_is_a_rock_outcrop FC