1. Aim: How does ozone get depleted in our atmosphere?
DO NOW
Interpret the meaning behind the picture that you see.

2. Ozone Part of ozone layer Present in the upper atmosphere
Protects us from sun’s harmful UV radiation
UV= ultraviolet

3. Ozone Layer

4. Depletion of Ozone Industries release pollutants
CFC’s are pollutants that cause thinning of the ozone layer or ozone layer holes
CFC’s also are released from refrigerators, air conditioning units, aerosol cans

6. Effect Ultraviolet radiation reaches our planet
Radiation is a mutagen, so our DNA can be changed
Increased rates of skin cancer
Some plants are killed

8. Solution Do not use or limit the use of CFC gases
Use safe products in refrigerators, air conditioners and aerosol cans

9. Video

10. Group Activity
CFC
Concentration
Year

11. Group Activity Questions
On looseleaf, with a partner, write down the answers to the following questions:
What is the independent variable in the graph?
What is the dependent variable in the graph?
What happened ~1988, to the CFC concentration?

12. Homework Answer the following questions, on loose-leaf:
1. What type of products release CFC’s into the environment?
2. What do CFC’s do to the ozone layer?
3. How are humans affected by the thinning of the ozone layer?