Composition of the atmosphere Quiz
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5 questions, one answer each
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1. Which gas makes up about 78% of dry air?
- A. Oxygen
- B. Argon
- C. Carbon dioxide
- D. Nitrogen
2. 100 cm³ of air is passed over hot copper and 79 cm³ of gas is left. What is the percentage of oxygen?
- A. 79%
- B. 21%
- C. 100%
- D. 0.04%
3. Which gas was released in the largest amount by early volcanoes?
- A. Oxygen
- B. Carbon dioxide
- C. Argon
- D. Hydrogen
4. How did the oceans form?
- A. Water vapour condensed as the Earth cooled
- B. Volcanoes released liquid water
- C. Oxygen reacted with hydrogen in plants
- D. Comets filled them with carbon dioxide
5. Which process increased the percentage of oxygen in the air?
- A. Combustion
- B. Respiration
- C. Photosynthesis
- D. Condensation