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

  • Photosynthesis
  • Nitrogen Fixation
  • Volcanic Activity
  • Dissolution in the oceans

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

  • Hydrogen
  • Sulphur Dioxide
  • Ozone
  • Carbon Monoxide

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

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

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

  • 57%
  • 78%
  • 76%
  • 21%

10. Why are the water vapour levels higher in summer?

  • Hotter average temperatures and longer day hours
  • Hotter average temperatures and less average rainfall
  • Hotter average temperatures and more average rainfall
  • Longer day hours and less average rainfall