so·li·fluc·tion 
(sō′lə-flŭkshən, sŏl′ə-)
(sō′lə-flŭkshən, sŏl′ə-)n.
The slow, downhill movement of soil or other material in areas typically underlain by frozen ground.
[Latin solum, soil + Latin flūctiō, flūctiōn-, a flowing (from flūctus, past participle of fluere, to flow; see bhleu- in the Appendix of Indo-European roots).]