Across
- 2. Disease causing organism
- 3. Anything that is not alive
- 6. Organism which hunts and eats other organisms
- 7. Overgrowth of bacteria an algae in an aquatic environment
- 10. Precipitation with excess nitric and sulphuric acid
- 11. Process of establishing forest
- 12. Triatom of oxygen that protects us from UV rays
Down
- 1. Animals that mainly eat plants
- 4. Tiny free floating organisms in aquatic system
- 5. An organism on or in which a parasitic lives
- 8. Rock Formations under the ground that carry water
- 9. Removal of excess salt from water or soil