Summary:
- Supervolcano eruptions are extremely rare in Earth's history.
- A supervolcano must erupt more than 1,000 cubic km (240 cubic miles) of material.
- No one knows when the next super eruption will be.
- Ash could block sunlight so much that photosynthesis would be reduced and global temperatures would plummet.
- Volcanic eruptions could have contributed to some of the mass extinctions in our planet’s history.
- The composition of the eruption is felsic or highly felic.