Water Resources

3. free from dirt.
7. Reverse__________is a process of forcing water through a special membrane to remove very small particles.
8. further treat used water to produce a very high grade water.
9. a process of converting sea water into fresh water.
12. an area over which rain falls and is collected.
15. the process of filtering water.
17. the amount of money expected, required, or given in payment for something
19. provide with something needed or wanted.
20. Internal__________on water is an arrangement between two or more countries regarding the supply.

1. retrieve or recover
2. having substances which harm the environment.
4. Water__________occurs when there is a shortage of water.
5. the action of preserving something.
6. being in a weak or unfavorable position.
10. a colourless, transparent, odourless, liquid which forms the seas, lakes, rivers, and rain.
11. convert waste into reusable material.
13. the process of water filtration used in desalination.
14. all the inhabitants of a particular place.
16. the knowledge, skills and tools that we use.
18. a large natural or artificial lake used as a source of water supply