[First Amendment]

A few days ago I read (had to be on FR, I don't bother with much else) about a lake at Yellowstone, which has hot spots, and the bottom of the lake is swelling, and other interesting factoids which I don't remember. It also mentioned stuff about there being the biggest caldera in the world (?!) in Yellowstone, and how previously (I don't know when, not recently!) the volcano (es) there spewed lava that covered much of the western US....

[finnman69]

[Centurion2000]

Bulge in lake worries YNP scientists

Here's that article you were referring to. I believe that the last time Yellowstone lit off it buried Nebraska in about 6 feet of ash.

Original FR thread

[goody2shooz]

Yellowstone is the caldera of what is called a "Supervolcanoe".
For all the scary details see the following url:

http://www.bbc.co.uk/science/horizon/1999/supervolcanoes.shtml

It will tell you everything you ever wanted, and didn't know you feared, about this subject.