![](https://greekreporter.com/wp-content/uploads/2024/08/Rare-earth-oxides-Us-department-agriculture-Public-domain.jpg)
Rare Earth Metals: The Next Gold Rush to Challenge China
These rare-earth oxides are used as tracers to determine which parts of a watershed are eroding. Clockwise from top center: praseodymium, cerium, lanthanum, neodymium, samarium, and gadolinium. Credit: Peggy Greb, US department of agriculture/Public …