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Across 6. ex: feces & agricultural chemicals from livestock feedlots 8. ex: DDT in zooplankton 0.04ppm, in fish 0.5ppm, in osprey 25ppm 10. ex: leaking septic-tank system 13. stage of water treatment when air is forced through water to release unwanted gases 14. process of watering plants that is most efficient 15. underground formation that contains groundwater 17. Asia uses 80% of its water for this 19. area of Earth's surface where water percolates down into an aquifer 21. stage of water treatment when bacteria cling to alum to form flocs 24. this act opened the door for other water-qauality legislation 26. occurs when plower plants & other industries use water in their cooling systems, then discharge warm water into a lake or river 27. can be added to water to help with dental hygiene 29. one of the first major oil spills to make the news in 1989 30. where 77% of freshwater can be found (singular) 31. type of water usage by the world that is only 8% 32. this is the area around the Amazon River equal to the size of Europe 33. amamount of space between particles where water can collect

Down 1. water can flow through particles 2. the method of providing plants with water other than precipitation 3. costly process of turning saltwater into fresh water 4. fertilizers mix with lakes and rivers; can cause algal blooms & death of water animals 5. solid material that remains after wastewater treatment 6. ex: soil runoff from farms & construction sites 7. ex: unlined landfills 9. using plants that do not need much water to survive in one's landscaping to conserve water 11. comprises 97% of Earth's water 12. builds behind a dam and can be used for drinking water, recreation, and industry 16. process of watering plants that can lose up to 80% water through evaporation 18. where 22% of freshwater can be found 20. other name for CERCLA, makes owners etc. pay for their own hazardous waste 22. substance that runs off from cities and towns to pollute oceans more than large spills 23. drinkable water 25. organisms that cause illness or disease 28. once you dig one, the only way to go is further down