We found one dictionary that defines the word molten rock:

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1. Molten rock: Wikipedia, the Free Encyclopedia

Phrases: molten rock underground, molten volcanic rock, more... ▸ Words similar to molten rock ▸ Usage examples for molten rock ▸ Idioms related to molten rock ▸ Wikipedia articles (New!) ▸ Words that often appear near molten rock ▸ Rhymes of molten rock ▸ Invented words related to molten rock