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Water Treatment
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12. What is the main purpose of water treatment?
To clean water before supplying it to homes.
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4. Why is chlorine added to the water?
To kill harmful germs that are too small to be filtered out
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7. After the water is cleaned and germ-free, where is it stored before it goes to your house?
In large storage tanks (on hills or tall towers)
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5. Why is fluoride added to the water?
To prevent tooth decay
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Red sea and black sea are separate from _______.
oceans
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11. What is desalination?
The process of removing salt from seawater is desalination.
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Pacific ocean covers about________ of the earth .
one third
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What % of the Earth's surface is covered in water?
71%
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Water vapour is the _____ gas.
invisible
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8. What are the water mains?
Water mains are the large underground pipes that carry water to our homes.
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6. What materials are used in filtered beds to remove smaller particles?
Sand and gravel
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1. Where does our water originally come from before it reaches the dam or well?
It comes from rain and snow
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3. Name two chemicals that are added in water supply.
Chlorine and fluoride
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2. What is an artificial lake created by a dam called?
A Reservoir
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9. What do we call water that has been used in our homes or factories?
Sewage
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10. Why are chemicals added to the settling tanks before the filter?
To make bigger pieces of dirt and soil stick together, settle down to the bottom of the tank.
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