Home Classifieds Directory Store About Contact Advertise
Free Trial Subscribe Sign In
Peggy Greb, U.S. Department of Agriculture
Rare earth elements are key ingredients in a wide range of modern products such as terabyte hard-drives that fit in the palm of your hand, high-efficiency power generation and sophisticated military hardware. Clockwise from top center: praseodymium, cerium, lanthanum, neodymium, samarium, and gadolinium.