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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?
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