Test 2

---

Crossword puzzle

Across

2. Another word for pollute.
3. We need to _____ our water before we drink it.
4. A person swallows water or ______ it.
5. A step in water treatment where particles in water cling together.
9. Method by which farmers water their crops.
11. Name for pipe that carries water to your home.
13. Lake Huron is one of the _____ Lakes.
16. Water leaves the house by going down the _____.
17. Pipes that carry wastewater from your home.
18. Our water is usually purified in a treatment _____.

Down

1. A ____ in your pipes wastes water.
2. The hydrologic or water _____.
5. Chemical element used in water purification.
6. A chemical added in water treatment to help particles cling together.
7. When we need water, we turn on the ______.
8. Canada has less than _____ percent of the world's freshwater supply.
10. Rainwater contaminated by pollution from industry (two words).
12. Frozen water.
14. Process where oxygen is added to water in a treatment plant.
15. In many rural areas, wastewater goes into _______ tanks.
19. A chemical substance which can harm organisms.

True or false

T  F	1.  On the prairies, pulp and paper industries use the most water.
T  F	2.  Another name for wastewater is sewage.
T  F	3.  Once wastewater is treated, it is released into rivers and streams.
T  F	4.  Water is purified for our drinking purposes at a sewage treatment plant.
T  F	5.  All Canadian households have their own septic tanks.
T  F	6.  All wastewater in Canada is treated before it is released back into nature.
T  F	7.  Rainwater stands at 0 on the pH scale.
T  F	8.  Acid rain falling in Canada comes from Canadian and American industries.
T  F	9.  Effluent and greywater mean the same thing.
T  F	10. Oxygen is added to water in a treatment plant during the sedimentation stage.

Match the meanings

Show that you understand what happens in water purification and sewage treatment plants.

1. coagulation	(  )	impurities percolate through layers of sand, charcoal and gravel
2. sedimentation	(  )	what is left behind after wastewater is treated
3. filtration	(  )	purifying chemicals are added to water before it goes to your home
4. aeration	(  )	alum is added to the water causing dirt and other particles to stick together
5. sludge	(  )	water is sprayed into the air where it mixes with oxygen
6. primary treatment	(  )	impurities settle to the bottom of the tank
7. chlorination	(  )	stage at which solids are separated from liquids in wastewater treatment

---

| What's New | About Us | Topics | Publications | Weather | Home |

The Green LaneTM, Environment Canada's World Wide Web site

Important Notices