Across
- 2. landscaping using plants adapted to dry conditions
- 4. water that flows over land and collects in a stream or river
- 6. water that has been used in households, businesses, industries, or public facilities and drained or flushed down the pipes as well as polluted runoff from streams and storm drains
- 8. the pollution of a body of water as a result of human activity
- 13. fresh water found below the Earth's surface
- 14. a channel dug into an aquifer to reach groundwater
- 15. the process of moving water from its source to places where humans can use it
- 18. an artificial lake where water for human use is stored
- 20. the boundary between the zone of aeration and the zone of saturation in an aquifer
- 22. fresh water found on the Earth's surface
- 25. a method of wastewater disposal
- 26. pollution that comes from a specific location
Down
- 1. pollution that comes from many places over a large area
- 3. a spongelike formation of rock, sand, or gravel that holds water
- 5. having spaces or pores that allow water or other substances to pass through
- 7. the rapid growth of algae in an area that can cover the surface of the water and block sunlight from reaching plants below
- 9. not allowing water or other substances to pass through
- 10. the buildup of salts in the surface of soil
- 11. a disease-causing organism
- 12. a harmful algae bloom that produces a reddish pigment
- 16. a network of connected streams and rivers
- 17. relatively pure water with few dissolved salts
- 19. an area where surface water soaks into the ground and reaches an aquifer
- 21. all of the land area that supplies water to a particular river system
- 23. the process of removing salt from seawater
- 24. an obstruction placed in a river or stream to block its flow
