51.5 MB (4.0 MB compressed)
5197 x 3465 pixels
43.9 x 29.5 cm ⏐ 17.3 x 11.6 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Iron oxide in a stream. Close-up of iron oxide (rust) powder coagulating and flocculating in the surface of water in a small rivulet. Weeds or algae, serving as a nucleus, may be the main cause for this. Other than that a change in temperature or pH of the water may have enhanced the coagulation.
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