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.
Alerts In Effect. Autumn Begins Early. Autumn begins on September 23, but it arrives earlier than that at Rocky Mountain National Park. Autumn is a time of changes, especially weather-related changes, across all the altitudes in the park.