Water Pollution SG

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Across
  1. 2. These three letters stand for the amount of oxygen a quantity of water uses over a period of time
  2. 4. is produced by livestock, human activities, and sewage, and has to do with water
  3. 8. when a body of water is full of nutrients
  4. 9. large container that receives waste water, commonly found in remote places under homes
  5. 12. a species that indicates whether or not disease pathogens are present
  6. 13. The contamination of streams, rivers, lakes, or oceans with litter or human substances
  7. 15. basically vitamins found in foods needed for everyday life of organisms
Down
  1. 1. acids deposited on earth as rain or snow or as gases and particles
  2. 3. the act in 1972 created for more clean water
  3. 5. ___Source which is a diffuse area that produces pollution
  4. 6. when fresh water meets the ocean in form of a stream or lake
  5. 7. small sewage treatment system made up of a septic tank
  6. 10. area or commonly lakes without life and little oxygen concentration
  7. 11. a component of a septic system, made of underground pipes
  8. 14. ___Source which is a distinct point where pollution is directly produced