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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.

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[–] IAMTODAY777 1 point -1 points (+0|-1) ago