1What Is Meant by the Statement Water Is a Natural Resource ?

Test

Chapter 8 — Water

Name: ......

1What is meant by the statement ‘water is a natural resource’?

2How much of the world’s water is renewable fresh water available for our use on a sustainable

basis?

A0.01%

B0.1%

C1%

D10%

3Name the process that causes significant amounts of water to be lost from large storage areas such

as dams.

AFreezing

BMelting

CEvaporation

DCondensation

4If someone offered you some ‘turbid’ water would you be willing to drink it? Explain.

5What does the term ‘desalination’ mean?

AAddition of salt to water to kill pathogens.

BPurification of grey water so it can be added to the drinking water supply.

CRemoval of salt from sea water to produce drinking water.

DRemoval of an iceberg from Antarctic waters.

6How is ‘desalination’ relevant to a future supply of drinking water?

7aWhat is grey water?

bWhere can it be used?

cWhat are the benefits of using it?

8What is black water and can it be recycled as drinking water?

9Is using recycled water as drinking water a new idea? Explain.

10Describe ways in which use can be made of stormwater.

Test answers

Chapter 8 — Water

1A natural resource is something found in nature that is valuable to humans. Water is probably our

most valuable natural resource because without it we cannot survive.

2A(About 0.01%)

3C(Evaporation)

4Turbid water is cloudy and the particles in the water that make it cloudy could harbour bacteria

that cause disease.

5C(Removal of salt from sea water to produce drinking water.)

6Seawater is always available and not dependent on rainfall. Freshwater is provided in this way on

cruise ships and navy vessels, and in island communities. There are plans to build desalination plants for Perth, Sydney and the Gold Coast.

7 aGrey water is the name given to the water from showers, baths and the rinse

cycle of the washing machine in the laundry.

b Grey water can be used for flushing the toilet and on the garden.

cEstimates suggest that using grey water would save up to 400 L per family per day. By using grey water gardens could be kept green and lush with out adding to the water use in the home.

8Black water is the water from the toilet and from the kitchen. This water can be recycled. First it

goes through the sewage treatment plant. Then it can be returned to dams or water ways and then passed through the process all drinking water goes through.

9 This is not a new idea. Recycled water is used in places such as Singapore, areas of California and

England as part of their supply of drinking water and this has been the case for some time. It also happens in Australia though in these cases it is not intentional. Treated water from sewage treatment plants is returned to rivers and used as the water supply for towns further downstream. Sydney, Adelaide, Melbourne and Brisbane all have a proportion of recycled water in their water supplies.

10Stormwater is used for irrigation in parks and market gardens.

The water level in Albert Park Lake in Melbourne is topped up using stormwater instead of drinking water.

The polluted water pouring off roads is channelled into raingardens where it is filtered and cleaned. Raingardens can be landscaped into suburban gardens, city parks, school yards and large median strips.

Middle Years Science: CW–Chapter 8 Test1