Water Conservation

6. all of the land area that supplies water to a particular river system
7. excessive richness of nutrients in a lake or other body of water which causes a dense growth of plants and animal death from oxygen loss
9. Pollution from many places spread over a large area, such as runoff
11. Pollution from distinct locations, such as a factory or sewer pipe
12. The process of moving water from its source to places where humans use it, such as homes and farm fields

1. gardening or landscaping that reduces or eliminates the need for irrigation
2. Layer between the zone of aeration and area of saturation underground where water begins to fill the empty spaces in soil and rock
3. sponge-like formations of rock, sand, or gravel that hold water
4. sewage that digests organic matter and separates floatable matter and solids from the wastewater
5. Removing salt from seawater; either using evaporation, filtration, or reverse osmosis
8. large lakes that store water for human use
10. Layers of soil and rock containing spaces, or pores, through which water can pass