Arizona-
   Cat Mountain Debris Flow, Tucson Mountains                 
Cochise College         

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Roger Weller, geology instructor   

wellerr@cochise.edu  copyright 2008-R.Weller

dirt beneath channel boulders showing air pockets-B
As the debris flow moved down the slope, pockets of air were trapped
in the mud and silt.
 

Photo is copyright free for non-commercial educational uses. 
Just credit photo to R.Weller/Cochise College.