"...and what makes the Grand Canyon one of the most interesting canyons, in the world, is that the age of the rocks, are so old, yet the age of the canyon, is, in relative terms, new, in comparison; the rocks here, on the very bottom layer, of the canyon, are as much as 1.7 billion years old, these black rocks here, that's one thousand, seven hundred million years, but evidence shows, that the canyon itself, the grandest canyon, was actually formed, uh, by the Colorado River, in as little as six million years, which makes this canyon, a very unique canyon, indeed; on a geologic timescale, if you were to represent all of the time the Earth has existed, that is, 4.6 billion years, and represented it on a 24 hour clock, in the course of a single day, you would see that the oldest rocks, those would have been formed at about 3:07 in the afternoon, which is fairly early in the day, then the rocks on top of those were closer to 4:47, and so on, but the actual canyon, the canyon itself, wasn't formed until 11:58pm, that's just two minutes before midnight, if we count midnight as present day; now, how did the Colorado River do this in such a short time, well, the Colorado River, had a great advantage, it had its speed, flowing from a very high point to a very low point in a very short distance, it also had a large volume of water, so the effects of the erosion were much greater than that of a smaller river, and you have to understand that, at no point, was the Colorado River this big, or this deep, it simply opened up the channel, to allow, other forces of erosion to gain access to the very soft sedimentary rock, in order, to form, this geological masterpiece, the grandest canyon; now this canyon is unique because this canyon has many side canyons and those side canyons have other side canyons and that canyon canyon can canyon the canyon canyon's canyon canyon..."