Class 9 Science | Ozone

Science and Technology, Class 9

Ozone

O₃ · Earth's protective layer

What We Will Learn

🧪

What ozone is and how it forms

🌍

Where the ozone layer is and why it matters

⚠️

How CFCs thin the layer

🛡️

Effects of depletion and ways to protect it

💨Oxygen (O₂)

2 atoms per molecule

Colourless

Used in breathing

🔵Ozone (O₃)

3 atoms per molecule

Blue, dark blue as a liquid

Absorbs ultraviolet rays

The notes are free to read in full.

Presenter notes: Today we study ozone, another form of oxygen. Start by asking the class what life on Earth might be like without it.