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Desalination
Lesson: 7-8
Page 31-32
Lesson objectives:�
What can you see in these pictures?�How is water being used?
Let’s Discuss, these hot questions
Desalination plant
evaporation
rain
Solar power
Sustainable water supply
Let’s Watch and know: if Can Sea Water Desalination Save The World?
2
sustainable water supply
Reverse osmosis
Fresh water
desalination plant
Evaporation
Solar power
Answers
Advantages: none
Disadvantages: uses a lot of power; expensive; high carbon emissions; increases salt levels in sea water
2. Heat evaporation:
Advantages: none
Disadvantages: uses the most power
3. Solar power:
Advantages: no carbon emissions; cheap
Disadvantages: none
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