The Atmosphere

1. State 3 reasons why Earth is the only planet in our solar system which is likely to support life.

2. What two gases make up 99% of the Earth's atmosphere?

3. Complete this table

4. Why could there be no animal life on Earth until the ozone layer had formed?

5. What is Rayleigh scattering?

6. Which colours are scattered the most? The least?

7. Why is the sky blue?

8. Why are sunsets often red?

9. What is sky glow?

10. What other types of man-made pollution interfere with astronomy?