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eruption volcano molten rock magma lava molten rock volcanic eruption geological molten lava volcanic eruption volcanic landscape molten rock flow volcanic activity lava flow volcano eruption volcano lava geological activity molten rock eruption volcanic phenomena volcanic flow volcanic rocks molten rock landscape volcanic terrain molten rock surface volcanic surface molten rock formation volcanic formation molten rock texture volcanic texture molten rock pattern volcanic pattern molten rock structure volcanic structure molten rock material volcanic material molten rock substance volcanic substance