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A vast "raft" of volcanic rocks stretching over sq km 58 sq miles is drifting through the Pacific Ocean, scientists say. The sea of pumice - the size of 20, football fields - was first reported by Australian sailors earlier this month. Experts say the mass probably came from an underwater volcano near Tonga which erupted around 7 August according to satellite images.
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. Large "rafts" of the volcanic rock are more likely to form when a volcano is located in more shallow waters, say experts.
An Australian couple sailing their catamaran to Fiji were the first to report the "pumice raft", after inadvertently entering the rubble at night. They were temporarily stuck after rocks jammed their rudder, but then were able to navigate out of the field. They have since sent samples of the pumice stone - which range "from marble to basketball size" - to researchers at the Queensland University of Technology QUT in Australia.
Associate Prof Scott Bryan, a geologist studying the samples at QUT, said such pumice masses could be seen about once every five years in the region.
Associate Prof Bryan said satellite images showed the field had since divided into two main surface masses, with many trailing "ribbons" of rock. The pumice is currently drifting westwards towards Fiji, and is likely to pass New Caledonia and Vanuatu. It has also been forecast to reach Australia. Experts say the pumice is likely to become home to marine life as it drifts across the Pacific on ocean currents. So it's a way to renew ecosystems somewhere, but it also can introduce invasive species," Dr Jutzeler said.
If it reaches Australia, that could be a boon Boat Sailing Through Pumice Inc for the damaged Great Barrier Reef, some experts say. Coral regeneration has collapsed in the world's largest reef system following unprecedented bleaching events in and Rise and fall of marine volcano. Deep sea volcanoes found off Sydney. Sailors have been warned to stay clear of the potential hazard. Massive volcanic 'raft' found near New Zealand Deep sea volcanoes found off Sydney. Potential boost to reef. Rock rafts 'potential cradles of life' Barrier Reef 'coral babies' in mass decline.
Related Topics. Volcanoes Australia Pacific Ocean. More on this story. Published 13 May Published 13 July
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