An iceberg is formed when a glacier (a river of ice) reaches the open water. If parts of the glacier are pushed into the ocean, those parts eventually break off and become icebergs. You can find more information here: http://learnngain.blogspot.com/2008/07/h...

Ice bergs are formed when large chunks of ice break off of a larger, more solid ice structure. They normally break off of a glacier or an ice shelf. You can find more information here: http://hubpages.com/hub/What-Is-An-Icebe...