Across
- 4. Another word for a polluted
- 5. Human waste (from the toilet)
- 7. Another word for tiny
- 9. A mix of chemicals added to plants to help them grow
- 10. The water that flows off land when it rains
- 11. Describes things related to the home
- 12. A word that means the amount of a chemical found in water (for example 10 parts per 100 litres)
- 13. Water escaping slowly
Down
- 1. Another word for a pollutant or poison
- 2. Describes things related to factories
- 3. Chemicals that kill bugs
- 6. A chemical with symbol N, which plants need to grow
- 7. Tiny bacteria
- 8. Watering crops on a farm