There are two types of processes (or reactions): spontaneous and non-spontaneous. Spontaneous changes, also called natural processes, proceed when left to themselves, and in the absence of any attempt to drive them in reverse.
When does fall start in Alabama? Officially, the first day of fall is the Autumnal Equinox on September 23. However, the end of summer is considered to be the day after Labor Day, which is the last summer hâ¦oliday. Autumn leaves in the deep south usually begin in late October to early November. 4 people found this useful.
On Monday, Sept. 22, the Earth will have nearly equal amounts of light and darkness, as summer ends and a new fall season begins. Depending where you live, the changing colors of leaves or a sudden briskness in the air may have made it seem like the seasons had already shifted, but the equinox on Monday signals the official start of autumn.