has part participates in composed primarily of glacier An ice mass which is of sufficient mass that the action of gravity upon it overcomes the frictional forces holding it in place, causing it to deform and flow towards lower elevation. TGN:21141 FTT:648 FTT:756 rock glacier http://orcid.org/0000-0002-3410-4655 http://sweetontology.net/realmCryo/Glacier EcoLexicon:glacier glacial feature RockGlacier Geonames:H.GLCR The definition of glacier is highly variable. Two main issues exist: 1) Whether or not a mass of ice must currently show movement to be considered a glacier or not and 2) What is the relationship between ice sheets and glaciers (i.e., which is the parent in a parent/child relationship or whether they are distinct terms). envoPolar rock snow ice mass of compounded environmental materials glacial transport process