Vast 'pumice raft' found drifting in the Pacific Ocean
A vast "raft" of volcanic rocks stretching over 150 sq km (93 sq miles) is drifting through the Pacific Ocean.
The sea of pumice - the size of 20,000 football fields - was first reported by Australian sailors earlier this month. Experts say the mass likely came from an underwater volcano near Tonga which erupted around 7 August according to satellite images. Sailors have been warned to stay clear of the potential hazard.
Pumice is a lightweight, bubble-rich rock that can float in water. It is produced when magma is cooled rapidly.
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