An iceberg is a large piece of ice that has broken off from a snow-formed glacier or ice shelf and is floating in open water.

Since the density of pure water ice is ca.

920 kg/m3, and that of sea water ca.

1025 kg/m3, typically, around 90% 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.

This has led to the expression "tip of the iceberg", generally applied to a problem or difficulty, meaning that the visible trouble is only a small manifestation of a larger problem..

For more information about the topic Iceberg, read the full article at Wikipedia.org, or see the following related articles:

Ice shelf — An ice shelf is a thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface, ...  > read more

Antarctic ice sheet — The Antarctic ice sheet is the largest single mass of ice on Earth. It covers an area of almost 14 million square km and contains 30 million cubic km ...  > read more

Greenland ice sheet — The Greenland Ice Sheet is a vast body of ice covering roughly 80% of the surface of Greenland. It is the second largest ice body in the world, after ...  > read more

Larsen Ice Shelf — The Larsen Ice Shelf is a long, fringing ice shelf in the northwest part of the Weddell Sea, extending along the east coast of Antarctic Peninsula ...  > read more

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