Blue-Orange Aerial Shot (image) University of Iowa Caption While most people are familiar with microbes that occur above ground -- such as this orange-colored colony surrounding Grand Prismatic Spring at Yellowstone National Park -- microbes also occur around hydrothermal vents on the ocean floor, at depths where light cannot penetrate and where they trap carbon using chemical energy instead of sunlight. Credit Photo by Jim Peaco, National Park Service, via Wikimedia Commons: http://en.wikipedia.org/wiki/File:Grand_prismatic_spring.jpg. Usage Restrictions None 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.