Rocky Road (IMAGE) Columbia Climate School Caption This is geologist Paul Olsen at Arizona's Petrified Forest National Park, where 200 million-year-old rocks are helping reveal the long-ago motions of other planets. Credit Kevin Krajick/Earth Institute, Columbia University Usage Restrictions Credit must be given. 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.