magma

There are few things in nature as fascinating as volcanoes. There are also few things that are as deadly. There are regular old volcanoes, and there are super-volcanoes. Super-volcanoes have the capacity to wipe out civilization, and one such super-volcano in Italy appears to be waking from a 500-year slumber. [1]
Monte Nuovo (year 1538). Click for larger version.

There is a 10% chance the Yellowstone Supervolcano could blow sometime in the next 80 years; and while that’s a pretty slim chance, the event would devastate humanity.
Experts at the European Science Foundation (ESF) are warning that instances of volcanic eruptions are the highest in 300 years. They fear that a major eruption could kill millions of people and wreak havoc on the planet.