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10.6 The Atmosphere
10.6.2 State the gases that make up the atmosphere.
The atmosphere is made up mainly of:
- Nitrogen — approximately 78%
- Oxygen — approximately 21%
- Trace gases — approximately 1%
Key point
Nitrogen 78% — Oxygen 21% — Trace gases 1%.
10.6.4 Describe the variation of pressure as altitude increases.
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