Across
- 1. keeping wastage to a minimum
- 6. an arrangement between countries regarding water resources
- 10. removing salt from sea water to become fresh water
Down
- 1. an area which rain is collected
- 2. condense collected water vapour into fresh water during desalination
- 3. being in a unfavorable position
- 4. shortage of water to meet the needs of people
- 5. a process of filtering large sized particles from water
- 7. treating used water with the use of advanced technology to produce fresh water
- 8. knowledge and skills that is used to meet people's needs
- 9. molecules passing through a permeable membrane