刚刚：夏威夷的莫纳罗亚火山，世界上最大的活火山，已经开始喷发

JUST IN: Hawaii's Mauna Loa, the world's largest active volcano, has started to erupt, prompting volcanic ash and debris to fall nearby, authorities said Monday. During a 1950 eruption, the mountain's lava traveled 15 miles in less than three hours.