Design flaws show themselves.

[Chris Bernhardt]

Either gravity driven water can errode rock in a reasonable amount of time or it can't. I'm on the can't side. There has to be other agents involved.

Chris, Oregon

[Mark P]

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[John Kogel]

I have a question. Was the Grand Canyon carved by water erosion? Or is it a crack in the earth with a river running through it?

If it was carved solely by the Colorado river running over the ground, where did all the sand go?

[Chris Bernhardt]

It's a crack in the earth with a river running thru it and carbon-14 dating is a bunch of malarkey.

Just my opinion.

Chris, Oregon

[Marc]

I have a question. Was the Grand Canyon carved by water erosion? Or is it a crack in the earth with a river running through it?

If it was carved solely by the Colorado river running over the ground, where did all the sand go?

Wind and water erosion. It went where the water went.

Jest guessin'. It got me thru college.[]

Marc

[Mark P]

Erosion. I've read several books on the Canyon.

The best book I read this year was "Down the Great Unknown: John Wesley Powell's 1869 Journey of Discovery and Tragedy Through the Grand Canyon". Not so much about the forming of the Canynon; however, it is discussed. John Powell and his men were absoulutly the luckest and bravest of men, what an amazing piece of history. An easy and entertaining read.

[Tom Raymond]

Mark, I think you just named your show: Mark Perry, Easy and Entertaining!

[Jim Baird]

"...where did all the sand go?..."

There's a place in NE New Mexico called Great Sand Dunes where all the sand from a cpl of ranges/valleys, or whatever ended up. Very impressive.

[Denray]

Great info all. Thanks.

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[nookandcranny]

I'm taking a global view here. Moss and other organisms like water, so whether it is wear from the excess discharge or the organisms basking in the abundant water, extensions to the ground or to a lower gutter will likely help to preserve the roof. I write this recommendation in my comments when I see such things.

[Jim Baird]

Like the "pork" in "pork and beans", they are there, just not visible tot he naked eye.

Great info all. Thanks.

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[jimguy]

You have to love design flaws. In British Columbia, with all the rain we get. It feels like 50% off all new buildings, have serious flaws in their design.