1. Ozone
D. Crowley, 2008

2. Ozone
Wednesday, April 26, 2017Wednesday, April 26, 2017
To know what gases can cause the hole in the ozone layer, and what affect this can have on humans

3. Global Warming
Complete the global warming worksheet

4. Global Warming

5. Ozone
What is ozone?
The Earth is surrounded by a deep layer of gas called the atmosphere (a mixture of gases, including nitrogen, oxygen, argon and carbon dioxide)
Oxygen in the atmosphere can change its physical state from O2 to O3 which is known as ozone
O3 - ozone

6. Ozone
There is very little ozone at ground level but much more at very high altitudes (in the stratosphere)
Ozone plays some very important roles in protecting us…

7. Protection
The ozone layer protects us from harmful rays emitted by the sun
Ultra-violet light (UV) can cause both skin cancer and damage to the eyes, such as cataracts (this is where the lens does not allow light to pass through easily, blurring vision)

8. Damage
In the past century we have been rather good at damaging the ozone layer…
This has been via the use of chlorofluorocarbons (CFCs), e.g. fly spray; refrigerator coolants; aerosol sprays – the chlorine reacts with O3 and breaks it down
High flying jet aircraft exhaust gases also react with the ozone: Concorde was especially bad for this

9. No Ozone?
If the ozone continues to be destroyed as it is then we will experience a much higher concentration of the UV radiation emitted by the sun, which can cause skin cancer
Current estimates are that the Antarctic ozone hole is depleting at a rate of 4% per decade!