Across
- 2. The first step in sewage treatment that removes large solids is called __________
- 4. The energy-intensive method to desalinate seawater by boiling and condensing is __________
- 6. The process that increased atmospheric oxygen and decreased carbon dioxide is __________
- 8. The greenhouse gas more potent than carbon dioxide that is produced by livestock is __________
- 9. The environmental problem caused by sulfur dioxide and nitrogen oxides is acid __________
- 10. The process that formed oceans as Earth cooled from water vapour is __________
- 11. The water treatment step that kills bacteria using chlorine is called __________
Down
- 1. The effect where gases such as carbon dioxide and methane trap heat in the atmosphere is called the __________ effect
- 3. The type of converter fitted to car exhausts that turns CO and NOₓ into CO₂ and N₂ is a __________ converter
- 5. The term for water that is safe to drink but not pure because it contains dissolved minerals is __________ water
- 7. The sewage treatment step where solids sink to form sludge is __________
- 12. The type of digestion where bacteria break down organic matter in sewage using oxygen is __________ digestion