Supervolcanoes evolve superquickly
Huge underground magma chambers appear and erupt within just several hundred years
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2012/05/superfastvolcano.jpg?fit=860%2C460&ssl=1)
California’s Long Valley is the remains of a supervolcano that exploded 760,000 years ago. Quartz grains in rocks from the eruption suggest the magma chamber beneath it was there only briefly.
G. Gualda/Vanderbilt University