Slowing inner core (IMAGE) University of Southern California Caption The inner core began to decrease its speed around 2010, moving slower than the Earth’s surface. Credit USC Graphic/Edward Sotelo Usage Restrictions Credit must be given to the creator 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.