Other questions in this quiz

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

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

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

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

4. How does nitrogen support life?

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

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

  • 57%
  • 78%
  • 76%
  • 21%


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