Related Clues:

• Popocatepetl output
• Mountain ash?
• It's expanding Hawaii
• Melted chocolate, in some recipes
• Pumice, once
• Rock in motion
• Chocolate __ cake
• ___ lamp (1960s 57-Across)
• Trippy lamp
• ___ flow
• Volcano's product
• It's ejected from a volcano
• It flows from a volcano
• It comes from a volcano
• Volcano's substance