Across
- 2. The process blocked for aquatic plants when oil or algae restrict sunlight
- 5. Aquatic animals may suffocate and die due to a lack of this gas in polluted water
- 8. The second stage of NEWater production is reverse _______, which uses a semipermeable membrane
- 10. Singapore's diverse water supply strategy is known as the Four National ____
- 11. Runoff containing these chemicals causes the rapid growth of algae
- 12. Organisms that grow rapidly due to fertiliser runoff, eventually suffocating aquatic life
- 13. Rubbish like plastics and metal containers that can trap or be swallowed by marine animals
- 14. A layer of this on the water surface prevents air from entering and clogs fish gills
Down
- 1. Industrial _____ from factories can contain chemicals that are fatal to aquatic plants
- 3. The process that removes salt from seawater to turn it into drinking water
- 4. A large natural or artificial lake used as a source of water supply; Singapore has 17 of these
- 6. Singapore's ultra-clean, high-grade recycled water produced from used water
- 7. The first stage of NEWater production involves micro__________ to filter out larger solids
- 9. Untreated waste from homes that can contain harmful bacteria