Water Resources

3. increasing catchment areas will not only help to increase the amount of _________ collected in a country, but also help to keep the cost of water treatment down.
6. process of converting sea water into fresh water by removing salt from the sea water.
7. the process of water filtration used in desalination where water is boiled and the water vapour is collected and condensed into fresh water.
10. in order to control the rising demand of water, countries may increase the _____ of water.
11. the process of filtering water to remove larger sized particles and bacteria from the water.
14. nature ________ are often used as catchment areas because forests can retain a supply of fresh water.
16. recycled water or water ___________ is produced when impurities are removed from waste water through a treatment process.
19. rain is a natural event and a country has ______ control over the amount of rain that falls.
20. a reason for the uneven distribution of fresh water supply may be the differences in _______.

1. when the international agreements expire, countries will have to ___________ the terms for a new agreement.
2. an international _________ on water is an arrangement between two or more countries regarding the supply and use of water resources over a specific period of time.
4. being in a weak or unfavourable position.
5. if the problem of water constraint is left unchecked, it can lead to more problems such as the ________ of food for people throughout the world.
8. refers to knowledge, skills and tools that people use to meet their needs.
9. refers to the careful use of resources to ensure that wastage is kept to the minimum.
12. large-scale __________ projects are often developed to channel water from rivers, lakes and groundwater sources to farming areas that receive little rainfall.
13. water __________ occurs when there is a shortage of water to meet the needs of people.
15. fresh water which is stored in rivers, streams and lakes is called _______ water.
17. a _________ area refers to an area over which rain falls and is collected.
18. only one percent of the Earth's water is _____ water that is readily available for human consumption.