| Answer | Crossword Clue |
|---|---|
| URANIUM | Heaviest naturally occurring element |
| ASTATINE | Rarest naturally occurring element in the earth's crust |
| INHERENT | Occurring naturally |
| ORGANIC | Occurring naturally |
| ORE | Naturally occurring mineral |
| VIVO | In ... (occurring naturally) |
| STAGED | Not occurring naturally |
| MADE | Not occurring naturally |
| SALTPETER | Naturally occurring potassium nitrate |
| EOLITH | Naturally occurring chipped stone |
| SNOW | Naturally occurring hexagonal crystals |
