Icebergs are nothing more than solid water.
They float because the density of the ice is less than the density of sea water. Icebergs come in all shapes and sizes, they have been compared to mountains, pyramids and castles. Many icebergs are moulded into unusual and fascinating shapes by the action of the wind and waves. The process of melting causes an iceberg to change shape, too. Icebergs are formed both in the Arctic and the Antarctic oceans.