The Marapi volcano in Indonesia has erupted and killed at least 11 hikers, as a dozen remain still missing. Plumes of smoke and ash were sent 10,000 feet into the air after the sudden eruption on ...

Pyroclastic flows contain a high-density mix of hot lava blocks, pumice, ash and volcanic gas. They move very quickly down volcanic slopes, typically following valleys. Fuego's pyroclastic flow is ...