| Answer | Crossword Clue |
|---|---|
| MAGMA | Underground rock? |
| ORE | Underground rock |
| MAGMA | Underground molten rock |
| ORES | Underground rock bands? |
| CALE | Velvet Underground rock star |
| MINER | One involved with underground rock bands? |
| groundwater | Water held underground in the soil or in pores and crevices in rock |
| potholes | A deep natural underground cavity formed by the erosion of rock, esp. by the action of water |
