Outer core diagram (IMAGE) Florida State University Caption An illustration of the structure of the Earth from a research simulation to investigate the composition of the planet's outer core. Dark spheres in the core represent iron and tan spheres represent carbon atoms. The path taken by carbon atoms during the simulation are shown by the tan lines. Credit Suraj Bajgain Usage Restrictions This image may be used with proper attribution. 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.