found two definitions that made me laugh

[Brian Densmore]

The next time Yellowstone erupts, New Orleans will be 5 inches deep in ash.
Imagine 2500 Mt St. Helen's eruptions simultaneously. But it hasn't 
erupted like that in 600,000 years. Last eruption was 70,000 years ago.
I'd be more worried about Mt St. Helen's which is N. America's most active
volcano.

> -----Original Message-----
> From: David Nicol [
> 
> Yellowstone park is a huge caldera.  The next time that 
> volcano erupts, Denver
> will be waist-deep in ash.
>