Related Clues:

• Source of pumice
• 58-Down output
• 9-Down output
• Volcanic threat
• Steamy flow
• Content of some cones
• Flowing rock
• Hawaiian figurine material
• Pinatubo output
• 4-Down output
• Volcano's output
• Volcanic stuff
• ___ lamp (1960s novelty)
• Hot torrent
• Pinatubo flow