An ambiguous question. I will address what I think you are asking. Geologically, a substantial portion of the Grand Canyon was formed by sedimentary layers of sandstone and limestone over millions and millions of years. Each layer is a line. read more
It is possible to ride a boat through the Grand Canyon, but reservations must be made over a year in advance AND the ride is not exactly a "cruise" ship. read more
The other reason for the lines at the Grand Canyon is that it is one of the most visited National Parks in the United States. Just under 5million tourists visit every year. This causes long lines at the buses, the restaurants, the overlooks, and the public toilets. read more
The strata of rocks were deposited over geographically huge areas so that they have lateral continuity. Even if they are disturbed by erosion, faulting, folding and uplift, the stratification of the same regional layers of rock would be the same. read more