. "rare metals" . "rare-earth oxides" . "Rare-earth element" . . "rare earth minerals" . . "rare-earth ore" . "rare elements" . "rare earths" . "Ce, Pr, Nd, Sm, Eu" . . . "rare earth" . . "Rare earths" . "rare-earth element (REE)" . "rare earth oxides" . "rare earths metals" . . . "rare-earth element" . . . "Heavy rare earth" . "rare-earth mining" . "rare earth metals" . "Y, Dy, Ho, Gd, Sm, Nd, Eu" . "protect plant, animal, and human safety" . "Rare Elements" . "Pollution concerns" . "rare-earth compounds" . . "Rare Earth Elements" . . "REE" . . "REE-profiles" . "rare-earth minerals" . "rare-earth" . "rare earth elements)" . "Rare-earth_element#Environmental_considerations" . "Rare-earth element#Early classification" . . "Rare Earths" . . "rare-earth components" . . . "recover rare-earth elements" . "rare-earth metals" . "Rare-earth minerals" . . . "Rare Earth elements" . "REE-rich" . . "thulium and erbium-yttrium" . "Rare Earth Element" . . "rare-earth elements" . "rare earth elements" . "Rare-earth element#List" . "Rare-earth element" . . . "rarest elements" . . . "Light rare earth" . "Rare earth" . . . "rare earth element" . "Rare-earth" . . .