Deep Soil Cross-Section (IMAGE) Dartmouth College Caption This is ross-section of study site near Georgetown, CA. Over half of the world's soil carbon is stored below 20 degrees cm, making deep soil a large potential emitter of greenhouse gas carbon dioxide. Credit J. Bryan Curtis Usage Restrictions Contact david.s.hirsch@dartmouth.edu for photo rights & permissions 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.