Icebergs: Floating Ice Mountains

An iceberg is fresh water ice more than 15 meters long.

Icebergs break off glaciers or ice shelves and drift in oceans.

About one tenth of an iceberg's volume floats visible above water.

Pure ice density is 920 kilograms per cubic meter, seawater 1,025.

Antarctic ice shelves produce large flat, tabular icebergs.

The biggest recorded iceberg was 335 by 97 kilometres in size.

An iceberg in North Atlantic once rose 168 metres above sea level.

Smaller floating ice pieces are called bergy bits or growlers.

Icebergs melt mostly from ocean heat, influenced by water currents.

Air bubbles trapped inside icebergs create fizzing sounds when melting.

Icebergs can flip unexpectedly as they melt and lose balance.

Icebergs come in shapes like domes, wedges, blocks and pinnacles.

The word iceberg means 'ice mountain' from the Dutch ijsberg.

Icebergs are a serious hazard for ships navigating polar waters.

Much of an iceberg remains hidden underwater, like an iceberg's tip.