The upper part of a glacier, above the limit of perpetual snow. See Glacier.
Granular ice formed by recrystallization of snow. Synonymous with firn.
Officially the permanent, consolidated snow pack above a glacier, but now commonly used as a synonym for consolidated snow, or any kind of snow, for that matter
consolidated granular snow. This is common on glaciers and snowfields during the height of summer.
glacial ice formed by enormous pressure compressing snow
permanent granular ice formed by repeated freeze-thaw cycles
refers to an area that is perennial snow or firn. The area lying entirely within the zone of accumulation.