Ice floating in water
| An iceberg is a mass of ice floating in the sea. Most North Atlantic icebergs are made of fresh water, and orginate from Greenland glaciers. The Coast Guard's International Ice Patrol monitors the position of icebergs that could be of danger to mariners. |
Credit: U.S. Coast Guard, International Ice Patrol
For more info: http://www.uscg.mil/lantarea/iip/