Chemistry of the atmosphere

What you'll learn

1. 1

   Imagine a giant blanket of gases wrapped around Earth — that's our atmosphere! 🌍

2. 2

   What is the most common gas in the atmosphere?

3. 3

   Drag the gases to build the atmosphere — start with the biggest one!

4. 4

   Let's work out how much oxygen is in a room with 1000 litres of air.

5. 5

   If air is 78% nitrogen, how many litres of nitrogen are in 200 litres of air?

6. 6

   The atmosphere hasn't always been like this! Billions of years ago, there was almost no oxygen — just CO₂, methane, and water vapour.

7. 7

   What process added oxygen to the early atmosphere?