A layer of the atmosphere that is closest to the Earths surface Almost all weather occurs here Temperature decreases as altitude increases STRATOSPHERE Layer above the troposphere Extends from 1850 km ID: 650764
Download Presentation The PPT/PDF document "ALL ABOUT OZONE TROPOSPHERE" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
ALL ABOUT OZONESlide2
TROPOSPHERE
A layer of the atmosphere that is closest to the Earth’s surface
Almost all weather occurs here
Temperature decreases as altitude increasesSlide3
STRATOSPHERE
Layer above the troposphere
Extends from 18-50 km
Almost all ozone is found in this layerSlide4
WHAT IS OZONE?
Ozone is made of three oxygen atoms (O
3
)
Ozone absorbs UV radiation, and reduces the amount that reaches the earthSlide5
The oxygen we find in our atmosphere is made up of two oxygen atoms (O
2
)
Because of its chemical formulation, a single atom of oxygen (O) is unstable
O
3
is less stable than O
2
, because it wants to return to the diatomic state by giving up an oxygen atomSlide6Slide7Slide8
Ozone has the same chemical structure whether it is found in the
stratosphere
or the
troposphere
. Where we find ozone in the atmosphere determines whether we consider it to be Dr. Jekyll or Mr. Hyde. Slide9
In the troposphere, the ground-level or "bad" ozone is an air pollutant that damages human health, vegetation, and many common materials. It is a key ingredient of urban smog.Slide10
In the stratosphere, we find the "good" ozone that protects life on earth from the harmful effects of the sun's ultraviolet rays.Slide11
CHLOROFLUROCARBONS
Human-made chemicals
For many years, people thought CFC’s were miracle chemicals…
They are nonpoisonous, nonflammable, and do not corrode metals.
Used as coolants, to make plastic foams, and as a propellant in spray cans in everyday items (hairspray, deodorant, paint)Slide12Slide13
They are stable at the Earth’s surface…
BUT
CFC molecules break apart high in the stratosphere, and the molecules, specifically Chlorine, break apart (or eat away) the protective ozone layerSlide14Slide15Slide16