A vast “raft” of volcanic rocks stretching over 150 sq km (58 sq miles) is drifting through the Pacific Ocean, scientists say. 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 lava goes through rapid cooling and loss of gases.
Source: Vast ‘pumice raft’ found drifting through South Pacific Ocean – Likely from underwater volcanic eruption near Tonga