art-Graham-Pearson-diamond-1-620x349One hundred and fifty years ago, in Journey to the Centre of the Earth, French science-fiction forerunner Jules Verne pictured a vast sea that lay deep under our planet’s surface. Today, that strange and haunting image has found an unexpected echo in a scientific paper. That particular zone in the Earth, the transition zone, might have as much water as all the world’s oceans put together. Writing in the journal Nature, scientists said they had found an elusive mineral pointing to the existence of a vast reservoir deep in Earth’s mantle, 400 to 600 kilometres beneath our feet. It may hold as much water as all the planet’s oceans combined, they believe. The evidence comes from a water-loving mineral called ringwoodite that came from the so-called transition zone sandwiched between the upper and lower layers of Earth’s mantle, they said. Analysis shows a whopping 1.5 per cent of the rock comprises molecules of water. MORE