Unit 2: The Atmosphere - Gases in the Atmosphere

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

  • Volcanic Activity
  • Nitrogen Fixation
  • Dissolution in the oceans
  • Photosynthesis
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2. 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

3. What is the formula of methane?

  • CH
  • CH4
  • C4H4
  • CH3

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

  • Sulphur Dioxide
  • Carbon Monoxide
  • Ozone
  • Hydrogen

5. How does nitrogen support life?

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

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