Komatiite Lava (IMAGE) University of Washington Caption An ancient komatiite lava from the Komati Valley in South Africa. Notice the tool on the right for scale. Co-authors used these types of lavas from more than 3 billion years ago to learn how the chemistry of the mantle has changed. Credit CSIRO/Wikipedia Usage Restrictions With 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.