An area of floating pumice 250 nautical miles in length and 30 nautical miles wide in the South Pacific ocean. A huge cluster of floating volcanic rocks covering almost 26,000 square kilometres (10,000 square miles) has been found drifting in the Pacific. A huge cluster of floating volcanic rocks covering almost 26,000 square kilometres (10,000 square miles) has been found drifting in the Pacific, the New Zealand navy said Friday. Ads by Google Black Diamond Slate – High Quality S-1 Slate Roofing See Product and Job Photos – www.BlackDiamondSlate.com The strange phenomenon, which witnesses said resembled a polar ice shelf, was made up of lightweight pumice expelled from an underwater volcano, the navy said. An air force plane spotted the rocks on Thursday about 1,000 kilometres (600 miles) offshore from New Zealand and warned a navy warship that it was heading towards them. Lieutenant Tim Oscar said that while he knew his ship the HMNZS Canterbury was in no danger from the pumice, which is solidified lava filled with air bubbles, it was still “the weirdest thing I’ve seen in 18 years at sea”.

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Read more at: http://phys.org/news/2012-08-bizarre-ice-shelf-pacific.html#jCp