Kamchatka River (IMAGE) University of Southampton Caption Global chemical weathering has been dominated by volcanic arcs over the past 400 million years (pictured: a river draining Bakening volcano, Kamchatka Peninsula, Russia). Credit Tom Gernon, University of Southampton Usage Restrictions No restrictions. License CC0 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.