| Answer | Crossword Clue |
|---|---|
| RARE | ..-earth element |
| SCANDIUM | Rare earth element |
| CERIUM | Rare-earth element |
| YTTRIUM | Rare-earth element. |
| ERBIUM | Rare-earth element. |
| CERIUM | Element of rare-earth group. |
| IRON | Most common element on Earth, by mass |
| SCANDIUM | Rare-earth element named after where it was discovered |
| BORON | Element with a low atomic number that is not found naturally on Earth |
