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It's easy to see that this composite of two images shows a spring under conditions of low flow and high flow, but it's more interesting...
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Intermittent Spring, Off and On

Bridger-Teton National Forest, Wyoming, 2009

It's easy to see that this composite of two images shows a spring under conditions of low flow and high flow, but it's more interesting to realize that I made these two images only fifteen minutes apart.  Intermittent Spring, also called Periodic Spring, is thought to be the world's largest cold-water geyser.  In mid to late summer, the periodicity of the spring can readily be observed; from its low-flow state, sometimes just a trickle at best, the water volume steadily increases, flows for several minutes at its maximum, and then steadily decreases to the low-flow state.  And the process repeats. Photo © copyright by Greg Owens.

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