Extreme Volcanoes

The molten rock just under Earth''s solid crust sometimes erupts suddenly and violently, causing streams of red-hot lava and scorching high-speed avalanches called pyroclastic flows. Volcanoes can bury entire cities in ash, poison the air with suffocating gases, trigger earthquakes and tsunamis, and drastically alter our climate. Witness the world''s most extreme volcanic disasters throughout hist...