Across
- 3. a physical water treatment process using gravity to remove suspended solids from water
- 4. campylobacter infection
- 7. a pesticide used to kill unwanted plants
- 10. water on the ground surface enters the soil
- 11. toxoplasma infection
Down
- 1. the enrichment of an ecosystem with chemical nutrients
- 2. capable of decaying through the action of living organisms
- 3. salmonella infection
- 5. a reduction in the pH of the ocean that is caused by an uptake of CO2
- 6. TB
- 8. chemical compounds that are used to kill pests
- 9. the study of lakes and ponds