ECOLOGY

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Across
  1. 3. Triatom of oxygen that protects us from UV rays
  2. 4. Overgrowth of bacteria an algae in an aquatic environment
  3. 5. Tiny free floating organisms in aquatic system
  4. 8. Rock Formations under the ground that carry water
  5. 10. Removal of excess salt from water or soil
Down
  1. 1. Precipitation with excess nitric and sulphuric acid
  2. 2. Organism which hunts and eats other organisms
  3. 6. Process of establishing forest
  4. 7. Animals that mainly eat plants
  5. 9. An organism on or in which a parasitic lives