How Icebergs Form

Posted by on Friday, May 26, 2017

Icebergs form when chunks of ice calve, or break off, from glaciers, ice shelves, or a larger iceberg.

On the iceberg surface, warm air melts snow and ice into pools called melt ponds that can trickle through the iceberg and widen cracks.

It may subsequently become frozen into pack ice. As it drifts into shallower waters, it may come into contact with the seabed, a process referred to as seabed gouging by ice.

Almost 91% of an iceberg is below the surface of the water.

An iceberg is a large piece of freshwater ice that has broken off a glacier or an ice shelf and is floating freely in open water.

The International Ice Patrol, formed in 1914 in response to the April 1912 sinking of the Titanic, which killed 1,517 of its 2,223 passengers, monitors iceberg dangers near the Grand Banks of Newfoundland and provides the "limits of all known ice" in that vicinity to the maritime community.

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