World's biggest iceberg on the move after 30 years
By Jonathan AmosScience correspondent
BBCThe world's biggest iceberg is on the move after more than 30 years being stuck to the ocean floor.
The iceberg, called A23a, split from the Antarctic coastline in 1986. But it swiftly grounded in the Weddell Sea, becoming, essentially, an ice island. At almost 4,000 sq km (1,500 sq miles) in area, it's more than twice the size of Greater London.
The past year has seen it drifting at speed, and the berg is now about to spill beyond Antarctic waters.
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