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).
Best Answer: As far as the globe - there is the Vernal Equinox (Start of Autumn in Northern Hemisphere; start of Spring in the Southern) on the 22nd of September. Winter starts in the northern hemisphere on December 22nd (start of summer in the southern hemisphere) Spring starts in the northern hemisphere on March 22nd (That is the first day of autumn in the southern hemisphere) Summer starts in the northern hemisphere on June 22nd (First day of winter in the southern) Has to do with the tilting of the earth on it's axis. Source(s):