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ozone layer

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Philip Han

on 8 October 2013

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Transcript of ozone layer

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
ozone layer
What is the ozone layer?
The ozone layer is a layer in the stratosphere surrounding the Earth, that has large amounts of ozone in it. The layer protects the Earth from the sun's harmful ultraviolet radiation.

What will happen to life on Earth if ozone depletion continues?
Without the ozone layer shield from the sun, land and water life would suffer. Experts believe that for every 1% drop of protection, there is an increase of around 2% in UV-B rays which will get through to the Earth's surface.
What can be done to prevent ozone depletion?
Always plug off electronic appliances when they are not in use. They emit CFCs in air!
Walk and avoid use of vehicles as much as possible. Use public transportation!
Conserve energy to slow down global warming! Change the light bulbs at home to compact fluoroscent light bulbs, and buy energy efficient electronic appliances.
Factories releasing
harmful chemicals
Ozone Layer
Chlorofluorocarbons (CFCs)
Carbon tetrachloride
Methyl chloroform
Methyl bromide
Human-produced ozone-depleting gases

What causes ozone depletion?
Ozone depletion process
On personal level...


Countries around the world, including the United States, have decided to discontinue production of ozone-depleting substances, such as CFCs, halons, carbon tetrachloride, and methyl chloroform.
Skin cancer
Cataracts (a clouding the eye's lens)
Weakened immune systems
Plants & Marine life
Negative effect on physiological and developmental processes of plants and animals
Reduced crop yield
Disruption in the marine food chain
Montreal Protocol:
The ozone layer plays a crucial role in supporting life on the Earth.
Why is it important?
Too much UV can cause...

Ozone Depletion & Global Warming
Peter Han (6-M)

UV Protection

UV rays
The ozone layer absorbs UVB which causes many harmful effects including skin cancer, cataracts, and harm to certain crops and marine life.
Human activities have damaged this shield.
Green house effect
Heat trapped in the troposphere
Temperature increase in the troposphere
Temperature decrease in the stratosphere
Destruction of vulnerable ozone molecules
Ozone depletion
Global warming plays a significant role in the ozone layer depletion.
Ozone Depleting Substances
Full transcript