What happens when a volcano erupts?
Volcanoes are incredibly complex geological systems. They are capable of generating many dangerous effects in the form of lava follows, fallout, and lahars – as well as associated hazards such as seismic shocks, tsunamis, or landslides. About 500 million people currently live in regions of the world directly subject to volcanic risk, and it is estimated that about 250,000 persons died during the past two centuries as a direct consequence of volcanic eruptions.