1. 
   Cryoturbation
   In gelisols (permafrost soils), cryoturbation (frost churning) refers to the mixing of materials from various horizons of the soil down to the bedrock due to freezing and thawing. Cryoturbation occurs to varying degrees in most gelisols. The cause of cryoturbation lies in the way in which the repea...
   Found op http://en.wikipedia.org/wiki/Cryoturbation
   
   
2. 
   cryoturbation
   cryoturbation Disturbance of the soil surface by the action of freezing or of alternate freezing and thawing.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2197/
   
   

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