I believe it. Came off a ski lift on the top of the mountain at Tahoe a few weeks ago and felt like my face was being sandblasted. Got down the hill fast as I could. I can only imagine what a million years of that could do to solid rock.
"How long is eternity? Imagine the tallest mountains known, made of the hardest rock.
Now imagine a scarf of the finest silk brushing against those mountains every day.
When those mountains have been reduced to dust by that scarf, that is the beginning of eternity."