| Answer | Crossword Clue |
|---|---|
| GALENA | Lead's principal ore |
| BAUXITE | Principal ore of aluminum |
| GALENA | Principal ore of lead |
| NIOBIUM | Its principal ore is columbite |
| Answer | Crossword Clue |
|---|---|
| GALENA | Lead's principal ore |
| BAUXITE | Principal ore of aluminum |
| GALENA | Principal ore of lead |
| NIOBIUM | Its principal ore is columbite |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.