Unit 4 Water World

Question 1

Give 3 reasons why water supply in the Sahel is unreliable

Answer 1

1. There may be distinct weather seasons
2. Weather cycles can occur. E.g. 3-5 wet years and the same number of dry years
3. Evidence of global warming and a continuing rise in temperature

Question 2

Give 3 forms of intermediate technology

Answer 2

1. Play pumps- South Africa
2. Tube wells- Tanzania
3. Rainwater harvesting

Question 3

Benefits of the three gorges dam

Answer 3

1. Flood risk is reduced
2. Water for irrigation is ready to use from the lake formed behind the dam
3. Hep is generated. Worlds bigger
4. The dam saves 31 million tonnes of coal from being used each year
5. River is more navigable

Question 4

Disadvantage of the three gorges dam

Answer 4

1. Farmland lost
2. 1.3 million people were forced to leave homes
3. Important cultural and archaeological sites lost
4. Risk of landslides
5. 22.5 billion U.S. Dollars
6. Sediment builds up

Question 5

What is water stress?

Answer 5

When there is not enough water available to meet the demands of the people or the quality of the water is not good enough to use

Question 6

How can humans manage water pollution?

Answer 6

1. Sewage is treated before it can be pumped into rivers
2. Use of fertilisers on the land is regulated to reduce pollution
3. Factories get rid of those products before they return water
4. Plastic is sent to recycling centres rather than being dumped in the river