1. What is the formula of methane?
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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. Which of these gases is created using UV radiation?
- Sulphur Dioxide
- Carbon Monoxide
4. 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
5. Why has the percentage of oxygen increased from the early atmosphere to now?
- The activity of bacteria
- The photosynthesis of plants
- Volcanic eruptions
- Human respiration