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[–] Gringojones 0 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

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[–] IAMTODAY777 2 points -2 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?

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[–] Gringojones ago 

Maybe it was a strip mine for some ancient aliens.