Atmosphere. Science State Board, Class 6: lessons, tests, tasks.

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1.	Presence of air
2.	Properties of air
3.	Atmosphere
4.	Layers of the atmosphere
5.	Priestley's experiment
6.	Mixture of gases
7.	Release of oxygen
8.	Oxygen in the air
9.	Carbon-di-oxide and nitrogen
10.	Atmosphere PDF chapter test

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

1.	Training test 1 Difficulty: medium	8
2.	Training test 2 Difficulty: medium	8

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Methodical recommendation

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