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The alert level has been downgraded for a Hawaiian volcano that ranks as one of the world's most active. No infrastructure is being threatened and there's no threat of significant ash emission into the atmosphere outside a limited area within Hawaii Volcanoes National Park. The downgrade by the Hawaiian Volcano Observatory comes one day after Kilauea began erupting again. In June, it erupted for several weeks, displaying fountains of red lava without threatening any communities or structures. Crowds flocked to the national park on the Big Island for safe views of the lava. The current eruption was confined to Kilauea caldera within the park. The observatory says it expects the eruption to remain confined to the summit region.

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In A.D. 79, long-dormant Mount Vesuvius erupted, burying the Roman cities of Pompeii and Herculaneum in volcanic ash. An estimated 20,000 peop…