Old snow which has been transformed into a dense material.
Well consolidated snow that has been formed by repeated freeze thaw cycle. Usually found in areas which have permanent snow fields or which hold the snow for long periods of time.
Permanent granular ice formed by repeated freeze-thaw cycles.
literally "last year's snow," consolidated snow deep within an ice sheet that is one step away from being solid glacial ice
The partially compacted granular snow that forms the fine grained old snow.
Permanent granular snow formed by repeated freeze-thaw cycles which is found above the head of a glacier.