Shuga is a spongy, porridge-like body of sea ice made up of small ice chunks a few centimeters across, floating in suspension in water. It forms from grease ice or from anchor ice that has broken free and risen to the surface, and represents the third stage in the sequence by which sea ice develops: frazil ice collects snow to become grease ice, wind and waves work the grease ice, and shuga forms before the ice consolidates further into sheets of nilas or rind ice as temperatures keep falling. The same process can occur in fresh water as well as salt water. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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