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