The Grand Canyon, which is of course what you mean by the scar, was carved into an enormous depth of relatively undisturbed layers of sediments which are understood by contemporary evolutionism to have been laid down excruciatingly slowly over hundreds of millions of years, which raises the question why no similar enormous scar was carved somewhere along the way. Why did all those hundreds of millions of years pass without such an event occurring, and then all at once huge disturbances occur that hadn't occurred before, cutting many canyons, carving all kinds of buttes and cliffs and whatnot, AFTER all the strata were there. The answer usually is a defiant "Why not?" but is that really a satisfactory reply to such a collection of facts? No, these facts are much better evidence for a single catastrophe that both built the layers and cut into them afterward, than they are for the prevailing theory.
Have you ever wondered about the incredible amount of meandering in the GC? How do you reconcile tremendous currents with that?
There is a lot of studies about meanderism - about the speed of water, how prone different strata is to eroding etc.
Several people who do science for living have rather eloquently explained to you how the method creationists employ is anything but scientific.
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