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Glacial mud, Matanuska Glacier | by NathanaelBC
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Glacial mud, Matanuska Glacier

The patterns formed by mud bubbling up and being swirled around by meltwater is fascinating. I don't know if the mud pictured above classifies as thixotropic as I didn't want to walk on it and mess it up, but here's a video I took of non-Newtonian glacial silt mud closer to the carpark:

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Taken on August 20, 2014