Park Ranger Dean Gallagher engages visitors with a “Life on the Edge” talk, held daily at the Jaggar Museum Overlook in Hawaii Volcanoes National Park.
Kilauea Volcano's summit vent -- In April 2008, a month after it opened, the vent within Halema'uma'u Crater was about 115 feet in diameter.
As of March 2013, it is more than 500 feet.
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