Mount Agung, the highest peak of the Indonesian tourist island of Bali, erupted this week, spewing vast amounts of dense smoke and hot ash 2,500 meters (about 8,200 ft.) up into the sky. According to the National Disaster Mitigation Agency, Bali airport had to cancel 450 flights, affecting over 75,000 people.
The volcano had a major eruption in 1963, killing upwards of 1,100 people.