Microspherules (IMAGE) University College London Caption Microscope image of silica droplets, or microspherules, found in the rock. Credit Natalie Cheng / Bridget Wade Usage Restrictions Only to be used in relation to this study 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.