iceberg

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iceberg,

mass of ice that has become detached, or calved, from the edge of an ice sheet or glacier and is floating on the ocean. Because ice is slightly less dense than water about one ninth of the total mass of a berg projects above the water. Greenland and other N Atlantic icebergs are usually peaked and irregular in shape; Antarctic icebergs are tabular, with flat tops and steep sides, and are sometimes extremely large when calved from an ice shelf. Icebergs differ from other ocean ices: sea ice is formed directly from the freezing of ocean water; pack ice is tightly packed fragments of sea ice; ice floes are small, floating ice fragments that separate from pack ice; and fast ice is ice attached to a shore.

Greenland is the source of most of the icebergs in the N Atlantic, where the iceberg season lasts roughly from February to October. As a consequence of the loss of the Titanic through collision with an iceberg in 1912, a patrol of N Atlantic shipping channels was initiated in 1914 by the international agreement of 16 nations. Patrols use planes and surface vessels equipped with radar, loran, and underwater sound equipment. A constant census of bergs is maintained, and the location of an iceberg is reported to any ship in its vicinity.

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iceberg

[′īs‚bərg]
(oceanography)
A large mass of glacial ice broken off and drifted from parent glaciers or ice shelves along polar seas; it is distinguished from polar pack ice, which is sea ice, and from frozen seawater, whose rafted or hummocked fragments may resemble small icebergs.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

iceberg

a large mass of ice floating in the sea, esp a mass that has broken off a polar glacier
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
The broad oval leaves are soft and pliable and are usually greener and some consider more tasty than crisphead types.
4) Cos (derived from the Greek island Kos) or Romaine (showing its Roman heritage) develops a distinctly upright, cylindrical head as opposed to the rounded form of crisphead. The inner leaves of cos become blanched naturally in the development of the head and are used for their crispiness and especially piquant flavour where they are a major ingredient in Caesar salad.
By harvesting outer leaves and thinnings I get salads from the slower-growing heading types, butterheads, crispheads or red iceberg a nd romaine, just as quickly as I do from leafy kinds.
Two crisphead lettuce cultivars (Beacon and Early Queen) were highly susceptible, and three other crisphead cultivars (Grand Max, Kahuna and Salinas) were intermediate between these extremes (fig.
By the final rating, 6 weeks after planting, differences among the crisphead lettuce cultivars had largely disappeared (fig.
Summer Crisp, aka "Batavian": Think of this group as an intermediate between crisphead and loose-leaf types.
Crisphead This crunchiest type of lettuce needs 80 to 90 days a long period of cool weather, but is worth the wait.
Crisphead varieties, such as 'Great Lakes', don't work well.
Economic and productive behavior of production of crisphead lettuce under different irrigation depths
CRISPHEAD have larger hearts and fewer outer leaves to discard.
Those of other varieties become crisp only along their ribs, and still other varieties become crispheads. Flavors may also take on distinctive qualities.
When plants first start crowding each other, harvest every other one so remaining heads are 8 to 12 inches apart (crispheads and larger loose-leaf varieties need more room than dwarf types do).