Yet the erosion patterns are identical. So one can't use the Grand Canyon as an example of millions of years of erosion, if the same feat can be accomplished in days.
I can't believe that you are claiming that because water can cut soft ash quickly and easily that it is impossible for water to require a much longer time to cut solid rock, but that seems to be what you are saying.
But if you want to use that logic, lets go back to the tilted box with sand and the garden hose. You should be able to get a small canyon in soft sand in just a few minutes. By your logic that "proves" that the St. Helens ash canyon couldn't have happened:
"So one can't use the Grand St. Helens ash Canyon as an example of millions of years days of erosion, if the same feat can be accomplished in days minutes."
Epic fail!
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