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Water vapour is the _____ gas.
invisible
Red sea and black sea are separate from _______.
oceans
Pacific ocean covers about________ of the earth .
one third
What % of the Earth's surface is covered in water?
71%
11. What is desalination?
The process of removing salt from seawater is desalination.
12. What is the main purpose of water treatment?
To clean water before supplying it to homes.
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.
9. What do we call water that has been used in our homes or factories?
Sewage
8. What are the water mains?
Water mains are the large underground pipes that carry water to our homes.
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)
6. What materials are used in filtered beds to remove smaller particles?
Sand and gravel
5. Why is fluoride added to the water?
To prevent tooth decay
4. Why is chlorine added to the water?
To kill harmful germs that are too small to be filtered out
3. Name two chemicals that are added in water supply.
Chlorine and fluoride
2. What is an artificial lake created by a dam called?
A Reservoir
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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