early Earth Illustration (IMAGE) Harvard University Caption An interior cutaway of the early Earth highlighting its major geodynamic processes. Magnetic field lines are drawn in blue and red emanating from the liquid core that generated them, while plate tectonic forces rearrange the surface and play a role in the churning circulation of the rocky mantle below. Credit Alec Brenner Usage Restrictions Credit must be given to the creator. License CC BY 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.