The world s supervolcanoes have been dormant for thousands of years - a point which unsettles many researchers examining what happens between supereruptions.
EXCLUSIVE: The world is full of risks and threats, from super-eruptions to all-out nuclear war. Three experts have weighed in and given their takes on what the end of humanity might look like and whether we have a chance of surviving it.
The Toba supervolcano in Indonesia last erupted tens of thousands of years ago - but scientists now think the traditional way of predicting an eruption at the site could be irrelevant.
Scientists previously warned that the Long Valley Caldera in California could erupt in the future after finding alarming signs beneath the park s surface.