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Shallow clear water and just the right wind conditions provided these strong patterns at the edge of a large hot pool. The patterns disappear in the shallower water near the edge.
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The blue background of this hot spring plus the complicated network provided some interesting patterns.
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Bacterial mats in cooler water provided the honey coloured background.
Here the pattern is complicated by fine ripples on a longer wavelength network.
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Bacteria in different water temperatures provided the background colours for this caustic network.
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Brown bacteria provided the background while the flow of water controlled the wave pattern.
The larger waves were about 10cm apart.
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Canon EOS 20D 2nd July 2007
Yellowstone National Park