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IcebergAn iceberg is a large piece of ice that has broken off from a glacier or ice shelf and is floating in open water.
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. 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 International Ice Patrol exists to monitor the presence of icebergs in the northern Atlantic Ocean and report their movements for safety purposes. The most famous sinking from an iceberg collision was the destruction of the RMS Titanic on April 14, 1912.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Iceberg" and from http://www.white-on.com
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