Related Clues:

• Eruption output, perhaps
• Volcano's outpouring
• It forms obsidian
• Magma, after an eruption
• Rock that cannot, in fact, be contained in a lamp
• Etna spill
• Mauna Kea emission
• What gives?
• On the outskirts of Lake Geneva with hot stuff running down the hill
• What volcano ejects
• It flows from volcano
• Stuff heatedly hurled out, as politician's left little room
• Immature insect form
• Obsidian
• Report of seaweed in rock