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.

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.

iceberg

a large mass of ice floating in the sea, esp a mass that has broken off a polar glacier
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.
Generally, the first crisphead and butterhead plants are started indoors four to six weeks and loose-head types two to three weeks, before the last average frost.
The young plants should be spaced 6 to 12 inches apart in the garden, depending on the variety; crispheads need the most room.
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.
2: Severity of symptoms of Fusarium wilt in two leaf lettuce cultivars, three romaine cultivars and five crisphead lettuce cultivars, 3 and 6 weeks after transplanting into a field infested with Fusarium wilt pathogen.
3: Disease severity over time in three plantings (established in June, July and August) of crisphead lettuce cultivars (A) Early Queen and (B) Grand Max.
4: Severity of Fusarium wilt symptoms in a leaf lettuce cultivar (Lolla Rossa) and two crisphead lettuce cultivars (Grand Max and Early Queen) maintained under three temperature regimes.
Crisphead This crunchiest type of lettuce needs 80 to 90 days a long period of cool weather, but is worth the wait.
Those of other varieties become crisp only along their ribs, and still other varieties become crispheads.