OT - definition of caldera

[A. Khattri]

On Sun, 27 Feb 2005, Robert L. Hemus wrote:

> This definition is from the March issue of National Geographic, article,
> Who Knew?
>
> "A caldera is essentially a great hole in the Earth where the surface
> has collapsed after a massive volcanic eruption."

One of the world's largest calderas is Yellowstone National Park - almost
the entire park is a gigantic caldera (hence the hot springs). It erupts
every several thousand years (on average) and right now we're about 90
years or so overdue. If it did erupt, anything within 1000 miles will
probably be covered in ash...


--
A.