Ice will not flow until it has reached a thickness of 30 meters ( 98 ft ), but after 50 meters ( 164 ft ), small amounts of stress can result in a large amount of strain, causing the deformation to become a plastic flow rather than elastic.
22.
The outcome can be a growing roughening and creation of protrusions ( i . e ., lumps ) above the original surface, in industrial manufacturing referred to as galling, which eventually breaches the oxidized surface layer and connects to the underlying bulk material which enhance the possibility for a stronger adhesion and plastic flow around the lump.
