[Secret Agent Man]

Mt St. Helens eruption in 1980 showed us how things that look really old can happen in days. The carved canyons with the super heated ash/snow mud carving through rocks, the hydrological sorting that layers sediments. If we had never seen it happen geologists would have looked at these layers and said “millions of years” to carve these canyons.

[null and void]

If we had never seen it happen geologists would have looked at these layers and said “millions of years” to carve these canyons.

You mean the same way they figured out the Scablands were formed in days when Lake Missoula drained?

[Mind-numbed Robot]

If we had never seen it happen geologists would have looked at these layers and said “millions of years” to carve these canyons.

All is relative. I remember that and it was millions of years ago. More seriouser, I lived in Dallas at the time and was amazed that we were blanketed with ash for several days. St. Helens seemed so far away yet there were parts of it all over the place.