Iceberg
An iceberg (berg is the German word for mountain) is a large piece of ice that has broken off from a glacier or ice shelf and is floating in open water.
An iceberg off Antarctica
Typically, around 8/9 of the volume of an iceberg is under water, and that portion's shape can be difficult to surmise from looking at what is visible above the surface. This has led to the expression "tip of the iceberg", generally applied to a problem or difficulty, meaning that the problem is only a small manifestation of a larger trouble.
The mass can be very durable and can easily damage sheet metal. As a result of these factors, icebergs are considered extremely dangerous hazards to shipping. The most famous sinking from an iceberg collision was the destruction of the RMS Titanic on April 14, 1912.
The International Ice Patrol monitors the presence of icebergs in the northern Atlantic Ocean and reports their movements for safety purposes.
Iceberg - artistic photomontage of what a whole iceberg might look like
The Antarctic icebergs are monitored by the National Ice Center and are named. The NIC assigns each iceberg larger than 10 miles along at least one axis a name composed of a letter indicating its point of origin and a running number. The letters used are as follows:
- A – longitude 0° to 90° W (Bellingshausen Sea, Weddell Sea)
- B – longitude 90° W to 180° (Amundsen Sea, Eastern Ross Sea)
- C – longitude 90° E to 180° (Western Ross Sea, Wilkesland)
- D – longitude 0° to 90° E (Amery Ice Shelf, Eastern Weddell Sea)
See also
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Iceberg is also a fashion label.