A23a Iceberg

The British Antarctic Survey says that one of the world’s largest icebergs is drifting beyond Antarctic waters after being grounded for more than three decades.

Origin – It split from the Antarctic’s Filchner Ice Shelf in 1986 but got stuck to the ocean floor for many years in the Weddell Sea.
Size – Around 4,000 square kilometres (1,500 square miles).
Movement – It has now ungrounded and is moving along ocean currents to sub-Antarctic South Georgia.It appears to be picking up speed because of wind and ocean currents.

Iceberg

An ice that broke off from glaciers or ice shelf and is floating in open water.
Criteria for Iceberg
- Height must be greater than 16 feet above sea level
- Thickness must be 98-164 feet
- It must cover an area of at least 5,382 square feet.
Tabular icebergs – They have steep sides and a flat top.
Non-tabular icebergs – They have different shapes, with domes and spires.

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