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photo (30 ft): iceberg (Environment Canada)
photo (45 ft): icebergs (Environment Canada)
Icebergs are large masses of floating ice derived from Glacier s, including ice shelves. The depth of a berg under water, compared with its height above, varies widely with different shapes of bergs. The underwater mass of an Antarctic iceberg derived from a floating ice shelf is ususally less than the underwater mass of icebergs derived from Greenland glaciers. A typical Antarctic Tabular berg, of which the uppermost 10-20 m is composed of old snow, will show one part of its mass above the water to five parts below but the ratio for an Arctic berg, composed almost wholly of ice with much less snow, is typically 1:8.