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Preview questions
1. What is air primarily made up of?
Oxygen and Carbon Dioxide · Nitrogen and Oxygen · Hydrogen and Helium · Carbon Dioxide and Argon
2. Which gas is essential for human respiration?
Nitrogen · Oxygen · Carbon Dioxide · Argon
3. What is the layer of air surrounding the Earth called?
Atmosphere · Lithosphere · Hydrosphere · Biosphere
4. Which of the following is a property of air?
Air has weight · Air is visible · Air does not occupy space · Air is not compressible
5. What happens to air pressure as altitude increases?
Air pressure increases · Air pressure decreases · Air pressure remains constant · Air pressure fluctuates
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