Unit 2: The Atmosphere - Gases in the Atmosphere

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1. 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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Other questions in this quiz

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

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

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

  • 57%
  • 78%
  • 76%
  • 21%

4. Which of these gases is created using UV radiation?

  • Ozone
  • Carbon Monoxide
  • Hydrogen
  • Sulphur Dioxide

5. How does nitrogen support life?

  • Used in respiration
  • Blocks harmful UV rays
  • Used as nutrients for plants
  • Used in photosynthesis


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