Picture a volcano spewing a river of molten lava burning so hot that it burrows its way through the Earth, moving so fast that a human couldn't outrun it.
원문출처 : http://www.cnn.com/2016/07/07/travel/lava-tubes-hawaii-volcanoes-national-park-nps-100/index.html
원문출처 : http://www.cnn.com/2016/07/07/travel/lava-tubes-hawaii-volcanoes-national-park-nps-100/index.html