Water

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Across
  1. 3. / In the U.S., high-pressured overhead ________ are the most common form of irrigation.
  2. 9. / The water that is beneath the Earth’s surface
  3. 12. / A flowing network of rivers and streams draining a river basin
  4. 15. / A method of providing plants with water from sources other than direct precipitation
  5. 18. / In some communities, fluoride may be added to prevent tooth decay
  6. 20. / An area in which water travels downward to become part of an aquifer
  7. 21. / A hole that is dug or drilled to reach groundwater
  8. 23. / The percentage of the total volume of a rock or sediment that consists of open spaces
  9. 24. / The percentage of freshwater that is frozen in glaciers and polar ice caps
  10. 27. / Bacteria and other impurities cling to the flocs, which settle to the bottom of a tank
  11. 28. / Pathogens are found in water _________ by sewage or animal feces, but can be removed with water treatment.
  12. 30. / The introduction into water of waste matter or chemicals that are harmful to organisms living in the water or to those that drink or are exposed to the water
  13. 31. / The source water supply is filtered to remove large organisms and trash
  14. 32. / Suitable for drinking
  15. 33. / The process of removing salt from ocean water
  16. 35. / The ability of a rock or sediment to let fluids pass through it open spaces or pores
Down
  1. 1. / Layers of sand, grave, and hard coal filter the remaining impurities
  2. 2. / Chlorine is added to prevent bacteria from growing in the water
  3. 4. / The freshwater we use comes mainly from ______ _____ _____ and from a relatively narrow zone beneath the Earth’s surface.
  4. 5. / Pollution that comes from many sources rather than from a single specific site
  5. 6. / The percentage of Earth’s surface covered with water
  6. 7. / The percentage of Earth’s water is salt water
  7. 8. / A renewable resource that’s used to circulate water
  8. 10. / A process that increases the amount of nutrients in a body of water through human activities, such as waste disposal and land drainage
  9. 11. / Pollution that comes from a specific site
  10. 13. / Much of the rain water ______ through the soil and down into the rocks beneath.
  11. 14. / The area of land that is drained by a water system
  12. 16. / Air is forced through the water to release unwanted gases, which reduces odor and improve taste
  13. 17. / A virus, microorganism, or other substance that causes disease
  14. 19. / An artificial body of water that usually forms behind a dam
  15. 22. / All the bodies of freshwater, salt water, ice, and snow that are found above the ground
  16. 25. / Alum is rapidly mixed into the water and forms stick globs
  17. 26. / A structure that is built across a river to control a river’s flow
  18. 29. / A level of the Earth’s surface where the rocks and soil are saturated with water
  19. 34. / A body or rock or sediment that stores groundwater and allows the flow of groundwater