The Royal New Zealand Navy has discovered 7,500 square miles of the lightweight stone pumice floating in the South Pacific. Royal Australian Navy Lieutenant Tim Oscar called it 'the weirdest thing I've seen in 18 years at sea.'
Pumice is a textural term for a volcanic rock which is a solidified frothy lava. Pumice is typically created when super-heated, highly pressurized rock is violently ejected from a volcano. Alternatively it can be formed when lava and water are mixed. Most pumice is light enough to float on water.