Mantle Heterogeneity (image) Brown University Share Print E-Mail Caption The mantle beneath Earth's mid-oceanic ridges contains heterogeneous blobs of material. A new study puts new constraints on the sizes of those blobs. Credit Boda Liu Usage Restrictions None Share Print E-Mail 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.