Number 3 water

4. source pollution, any single identifiable source of pollution from which pollutants are discharged,
5. water, water that collects on the surface of the ground
6. table, the level below which the ground is saturated with water.
7. zone, refer to those areas where water infiltrates through the permeable rock and sediment
10. the excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen
14. land consisting of marshes or swamps; saturated land.
17. plain, an area of low-lying ground adjacent to a river, formed mainly of river sediments and subject to flooding.
19. an area or ridge of land that separates waters flowing to different rivers, basins, or seas.
20. of or found in freshwater; not of the sea
22. source pollution, (NPS) pollution is caused when rainfall or snowmelt,
23. the concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed.
24. barrier constructed to hold back water
25. the tidal mouth of a large river, where the tide meets the stream.

1. when there is more water than land can absorb
2. diversion, the removal or transfer of water from one watershed to another.
3. a large natural or artificial lake used as a source of water supply
6. is an excavation or structure created in the ground by drilling to access liquid resources, usually water.
8. landscape (an area) in a style that requires little or no irrigation
9. gradual accumulation of substances
11. (of a material or membrane) allowing liquids or gases to pass through it
12. water that has been used in the home, in a business, or as part of an industrial process.
13. the process of removing salt from seawater
15. a body of permeable rock which can contain or transmit groundwater.
16. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
18. water held underground in the soil or in pores and crevices in rock.
21. system, a system or group of rivers so united that the water carried by the minor component streams finally unites in one body of flowing water