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).
Fall begins on Sept. 22. You have 3 long months of summer before the colder weather begins! 3. The first day of summer is going to be the longest day of the year! For those of us who live in the northern hemisphere, the first day of summer will be the longest day and shortest night of the year. There will be over 15 hours of daylight in the northern hemisphere!