Nova: Doomsday Volcanoes
Iceland is often considered an extremely peaceful, idyllic place, but it's native volcanas are among the largest active ones on earth. The 2010 eruption of Eyjafjallajakull shut down most of Europe. One other volcano is 10 times larger and grumbling, concerning scientists that an eruption could effect the entire globe! 2013/color/60 min/NR/widescreen.