Ringwoodite Illustration (IMAGE) University of Alberta Caption The first terrestrial discovery of ringwoodite by University of Alberta scientist Graham Pearson confirms the presence of massive amounts of water 400 to 700 km beneath the Earth's surface. Credit University of Alberta Usage Restrictions Include credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.