Did you know that the Grand Canyon was caused by the worldwide flood in Noah's day when God caused it to rain for forty days and forty nights? Genesis 6:17,18 Good experimental example.
I honestly still can't believe that people think the canyons were carved by a small amount of water over millions of years. There are giant sand dunes (like what you'd find at the bottom of a river bed) in the rock layers which proves the theory that there was a massive flood at one point in time that created a massive washout. I'm not even talking religion here, that's just a fact of physical science, don't be fooled by so called experts.