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The air composition and air pollution

1.	Air
2.	Composition of air
3.	Particles in the atmosphere
4.	Oxygen
5.	Air around us PDF chapter test

1.	Constituents of air Difficulty: easy	2
2.	Air and its uses Difficulty: easy	2
3.	Air and its properties Difficulty: medium	4
4.	Properties of air Difficulty: easy	1
5.	Atmosphere Difficulty: medium	3
6.	Composition of air Difficulty: medium	4
7.	Gases used by plants and animals Difficulty: medium	3
8.	Contents of air Difficulty: hard	9
9.	Terms of air Difficulty: easy	3
10.	Smoke and constituents of air Difficulty: medium	4
11.	Gases used for various processes Difficulty: hard	7
12.	Oxygen and its neccessity Difficulty: medium	4
13.	Gases present in the air Difficulty: easy	3
14.	Gases involved in various process Difficulty: easy	2
15.	Air composition Difficulty: easy	3

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Methodical recommendation

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