Iceberg. Huge masses of ice may break off the lower end of a glacier and fall into the sea. These masses are called icebergs, and they are made of frozen fresh water. Fog and icebergs are two of the greatest natural dangers to ships.
Iceberg. Huge masses of ice may break off the lower end of a glacier and fall into the sea. These masses are called icebergs, and they are made of frozen fresh water. Fog and icebergs are two of the greatest natural dangers to ships.