Snowpack density (IMAGE) Colorado State University Caption Wyatt Reis collects bulk snowpack density on an unburned northern slope near Cameron Pass in Colorado. The tree canopy in unburned areas prolongs snow by shielding it from sunlight. Credit Photo courtesy of Wyatt Reis Usage Restrictions None 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.