Circles in Nature

Challenge #46 in the Life in the Natural World series. Hosted by RuthC.
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In this challenge, show us circles formed by nature. This might be a flower, a mushroom, a leaf, or perhaps something formed by wind or water. Macro and close-up shots welcome. Subjects should be taken outside in their natural environment, not inside under studio lights. No balls or spheres, or spirals this time; they will have their own challenges later. No shots of the moon, (which is a sphere.) SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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Yellowstone Mud Pot
by poppyjk
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Submitted: Monday, 13th May, 2013 17:02 (GMT)
Taken: Wednesday, 13th September, 2006
Focal length: 105 mm
Shutter speed: 1/640 sec
Aperture: F9
ISO: 200
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