St Croix, St Thomas and St. john
Rome was corrupted already by its large expanse. the it was the factor of the people. the peopl ewere not satisfied with what was going on like the persecutions. Another thing that was happing was the amoun tof terrible and unbenifactory leaders. Some such as Nero Destroyed parts of the empire. The last factor is Religion. When the Christians Came along, they pretty much indirectly destroyed Rome.
This movement is called convection. It can be found in liquids, gasses and rheids - solids that can also experience movement ( on a big time scale), such as the earth mantle. One of the types of convection is diffusion: net movement of gasses from higher to lower concentration areas.
