These then react with the ozone molecules, resulting in their removal. CFCs have a lifetime in the atmosphere of about 20 to 100 years, and consequently one free chlorine atom from a CFC molecule can do a lot of damage, destroying ozone molecules for a long time.
exists and is an alternate of . In the northern hemisphere of Earth, Fall begins on the Autumnal equinox (22-23 September) (in Persian calender it will begin at the first day of Mehr) and ends on the Winter solstice (21-22 December). In the southern hemisphere of Earth, Fall begins on the Autumnal equinox (20-21 March) and ends on the Winter solstice (20-21 June).
Autumn: When the Leaves Fall. Autumn begins with the autumnal equinox (September 22, most years). The equinox is the point at which the sun is directly over the equator. From this point throughout the season, the pole is beginning to point away from the sun. The hemisphere is getting more night hours than daylight and this has a cooling effect.