[–] Gringojones 0 points 8 points 8 points (+8|-0) ago
Water and time. And weak rock also.
It's insane the amount of damage water can do. I've seen it cut through concrete and even granite. I work with a crawl space company and even humidity in the air is incredibly damaging. 1
[–] IAMTODAY777 2 points -2 points 0 points (+0|-2) ago
I can see why you would think that. It's certainly something we've been told our whole lives.
Do you have any suggestions on why we don't see lots of other canyons that are similar? If this explanation is the truth then isn't every river currently in the process of creating it's own canyon? The world is full of rivers, why do we only have a small number of canyons similar to the grand canyon?
[–] CameraCode0- 0 points 4 points 4 points (+4|-0) ago
Wasn't a river...it was Paul Bunyan draggin his axe
[–] MrPim 0 points 2 points 2 points (+2|-0) ago (edited ago)
Forgive this URL
https://www.bing.com/images/search?q=stone+staircase+worn+by+feet&FORM=HDRSC2&PC=U316
I wanted to give you multiple examples. Those are stone staircases worn by feet. Over a couple hundred years. Feet may be slightly more abrasive than water but the water had a Lot more time.
And there's also at least some wind erosion in the canyon