has part liquid water environmental material snow frazil ice slush ice These new ice classes refer to both marine water and fresh water ice. If using this term for annotation, use it in conjunction with another envo term to express whether the ice is in a marine, freshwater, or other system. http://orcid.org/0000-0002-3410-4655 envoPolar A slurry of frazil, snow, and liquid water.