Unit 2: The Atmosphere - Gases in the Atmosphere

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1. Which one of these processes increases carbon dioxide levels?

  • Photosynthesis
  • Nitrogen Fixation
  • Volcanic Activity
  • Dissolution in the oceans
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Other questions in this quiz

2. Why does the rate of photosynthesis increase in the summer?

  • Shorter day hours and decreased rainfall
  • Longer day hours and hotter weather
  • Longer day hours and increased rainfall
  • Shorter day hours and hotter weather

3. What percentage, on average, of the air is nitrogen?

  • 78%
  • 21%
  • 76%
  • 57%

4. Why has the percentage of oxygen increased from the early atmosphere to now?

  • Volcanic eruptions
  • The photosynthesis of plants
  • Human respiration
  • The activity of bacteria

5. Why has the percentage of hydrogen decreased from the early atmosphere to now?

  • It has been trapped underground
  • Human activity
  • It's escaped from the atompshere
  • It dissolved in oceans and rivers

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