There is that, alright.
Though I have read predictions that devastating quakes will mangle the Grand Canyon good. We shall see.
Then, how was Half Dome created if not by a big quake?
God only knows . . . I suspect.
Have fun while you can!
I can understand not wanting to drag 2 year olds and a cat around!
LOL.
thx
I'm gonna have to go with uplift due to plate tectonics followed by a glacier.
Aliens may have observed the process, but they're not fessing up to it at this point. (Though, George Bush would have to catch them first.)