Water World

Question 0

What is through flow?

Answer 0

Rainwater soaks into the soil and flows slowly through it to rivers

Question 1

What is overland flow?

Answer 1

Rain falls onto the ground and flows on the surface to rivers and lakes

Question 2

What is groundwater flow?

Answer 2

Rainwater soaks into rocks below the soil. It moves slowly though the air spaces

Question 3

What are the three main reasons why water supplies are unreliable?

Answer 3

1. There may be distinct water and dry seasons
2. Weather cycles can occur . So an area may get 3-5 dry years followed by the same number of wet years.
3. There is evidence for global warming and a continuing rise in temperatures

Question 4

What are some causes of river pollution?

Answer 4

• Untreated sewage pumped into rivers can lead to diseases
• fertilisers, pesticides and poison wildlife and affect water quality
• chemicals from factories can poison wildlife and affect water quality

Question 5

What are some ways to manage water pollution?

Answer 5

• sewage is treated before pumped into rivers
• use of fertilisers and chemicals on land is regulated to reduce pollution
• factories get rid of their chemical products before the return to the river

Question 6

What are some advantages of the tree gorges dam?

Answer 6

• Flood risk for homes, farms and factories is reduced along the Yangtze River
• hydroelectric power is generated by turbines in the dam
• the river is more navigable for ships and so transport is improved

Question 7

What are some disadvantages of the Three Gorges Dam?

Answer 7

• Good farmland lost because of the lake
• sediment is building up behind the dam
• important wetland areas have been destroyed

Question 8

What is a hand pump?

Answer 8

It’s a more efficient way of reaching underground water. There is less chance of the water being contaminated