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Theory

Exercises

1. Layers of air

Difficulty: easy

2
2. Air

Difficulty: easy

1
3. Scientists and their tests

Difficulty: easy

1
4. Atmospheric layers

Difficulty: medium

6
5. Flow of air

Difficulty: easy

2
6. Discovery of gases

Difficulty: easy

2
7. Depletion of ozone

Difficulty: easy

2
8. Uses of atmosphere

Difficulty: medium

5
9. Gases in the air

Difficulty: medium

4
10. Composite mixture

Difficulty: medium

4
11. Earth's protective layers

Difficulty: medium

4
12. Detection of gases

Difficulty: medium

4
13. Test for gases in air

Difficulty: hard

6

Tests

1. Training test 1

Difficulty: medium

8
2. Training test 2

Difficulty: medium

8

Teacher manual