Earth's outer core and silica crystals (IMAGE) Arizona State University Caption Illustration of silica crystals coming out from the liquid metal of the Earth's outer core due to a water-induced chemical reaction. Credit Dan Shim/ASU Usage Restrictions Attribute to ASU/Dan Shim 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.