Several Hawaiian Volcano Observatory geologists board a helicopter as large lava fountains erupt in the background during the The 1984 eruption of Mauna Loa volcano in Hawaii. Helicopters provided acc
Hawaiian Volcano Observatory geologists board a helicopter as lava fountains erupt behind them during Mauna Loa's 1984 eruption. R.B. Moore, U.S. Geological Survey from Reston, VA, USA, CC0, via Wikimedia Commons

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