https://padlet.com/lavanyaragu/Bookmarks Made with a warm hug en-us 2020-03-18 01:34:06 UTC 2020-03-18 02:33:15 UTC hello@padlet.com lavanyaragu https://padlet.com/lavanyaragu/Bookmarks/wish/463931731 Atmospheric chemistry 
• the earth’s atmosphere is essential for life
• the atmosphere (2000km) extends above earth
• 4 region=                                                        1.troposphere 2.stratosphere   3.mesosphere   4.thermosphere 
* Troposphere ( 78.09% nitrogen, 20.94% oxygen, 0.93% argon & 0.03% carbon dioxide) 
-10-16km extends from earth
-chemical reaction ( photosynthesis, respiration,nitrogen fixation)
Chemical balance of troposphere( carbon dioxide removes from atm in photosynthesis and if carbon dioxide returns to atm by respiration)
Photosynthesis is for maintaining concentration of carbon dioxide in the atm
* Stratosphere 
- 60km extends from earth
- ( nitrogen, oxygen, ozone and some water vapour)
- this all changes called photochemical 
Chemical balance of stratosphere 
-ozone is an important gas in stratosphere 
- produced by photochemical reaction 
€ Damage to ozone layer by chlorofluorocarbons 
- lack of reactivity, low toxicity and low flammability 
(• initiation • propagation • termination)
 * ozone depletion process=
    1. CFC release 
     2. CFC rise into ozone layer 
      3. UV release CL from CFC 
     4. CL destroy ozone 
    5. More UV can depleted ozone 
    6. More UV can make skin cancer 
   =Residence time is length of time a pollutant can remain in the atm
Residence time= conc. of given species/ rate of removal)

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