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volcano eruption lava eruption molten rock magma crater vent ash cloud gas sky mountain peak summit slope side flank base foot toe caldera lava flow lava field lava plain lava tube lava tunnel lava cave lava lake lava pond lava pool lava dam lava levee lava barrier lava wall lava cliff lava arch lava bridge lava tower lava pinnacle lava spire lava cone lava dome lava shield lava fan