1. Ozone Layer The oxygen we breathe is made up of 2 oxygen atoms.
An ozone molecule is made up of
3 oxygen atoms.
Oxygen Molecule, O2

2. Ozone Layer The ozone layer shields us from the sun’s harmful rays.
Ozone absorbs most of the ultraviolet radiation that enters the atmosphere.
Ultraviolet radiation is an energy that comes from the sun, can damage your skin and cause cancer.

3. CFCs
Chlorofluorocarbons (CFCs) are chemical compounds that destroy the ozone layer.
CFCs are found in some:
Refrigerators
Air conditioners
Aerosol sprays
Styrofoam packaging

4. The Ozone Hole
The size of the ozone hole increases and decreases throughout the year.
It begins to form in September
It’s biggest in October
It is gone by December
In the mid 1990s, many countries banned the use of CFCs. Now there are less CFCs in the atmosphere!

5. 1.) Ultraviolet light breaks up CFC molecules.
- UV light Cl C F

6. 2.) A released chlorine atom breaks up ozone (O3) molecule.Cl O

7. 3.) The chlorine atom joins with an oxygen atom, leaving behind an oxygen molecule.Cl O

8. 4.) A free oxygen atom breaks the chlorine-oxygen bond.Cl O

9. 5.) Oxygen atoms rejoin to form a normal oxygen (O2) molecule.

10. 6.) Released chlorine atom breaks up another ozone (O3) molecule.Cl O