Scientists Ask: Just What Sustains Earth's Magnetic Field Anyway? (image) Carnegie Institution for Science Share Print E-Mail Caption This is an illustration of how the diamond anvil cell is used to mimic and study planetary core conditions, courtesy of Stewart McWilliams. Credit Stewart McWilliams Usage Restrictions With credit Share Print E-Mail 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.