Yeah, Kendall, that one is a doozy. Yellowstone is a caldera. I don't think most people who drive through and ogle at the various wonders such as boiling pools and Old Facefull are aware that they are meandering around inside a huge volcanic crater.

I heard recently that folks noticed that the water in a lake in Yellowstone seemed to be rising. No one had noticed until then that, on the other side of the lake, the water was receding. What was actually happening was that the lake was tilting! This meant that magma was starting to push upward.

If it decided to push upward a bit more enthusiastically, I might get a bit unpleasant in the neighborhood. And beyond!

"To the moon, Alice!! To the moon!!"

Most people would be a bit unsettled, I think, if they realized that the earth is mainly a big ball of boiling iron, and we're living on the slag that's drifting around on top.

This gives you a bit of an idea.

Don Firth