Lakebed with drilling rig (IMAGE) University of Arizona Caption During the dry season, evaporating water leaves behind trona crystals, which grow on the lakebed of Lake Magadi, the southernmost lake in the Kenyan Rift Valley. A drilling rig used in the study is seen towering above the dry lakebed. Credit Andrew Cohen/University of Arizona Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. License Original 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.