Water Quality (Environemtal Consequences Agricultural Activity, Human Pressures On Lakes And Aquifers)

Question 1

What happens when eutrophication occurs?

Answer 1

1. encourages growth of algae
2. Plants die, no photosynthesis
3. Bacteria decompose dead plants
4. Uses up the oxygen in water = low oxygen levels kill animals living in the lakes

Question 2

What is agro- chemical run-off?

Answer 2

Excessive use of fertilizers leading to contamination of groundwater

Question 3

What are the 2 stakeholder examples for eutrophication?

Answer 3

1. Roskilde Fjord
2. Lake Erie

Question 4

Eutrophication causes an increase in minerals such as…

Answer 4

Nitrates & phosphates

Question 5

What is salinisation?

Answer 5

When soluble salts accumulate in soil, drastically affecting agricultural productivity and ecosystem health

Question 6

Cause of soil salinisation are…

Answer 6

• dry climate
• high evaporation rate
• irrigation with salt

Question 7

What is nonpoint source pollution?

Answer 7

When runoff from rain & snowmelt carries pollutants into waterways such as rivers, streams, lakes, wetlands & groundwater

Question 8

What is the case study for human pressure on lakes and aquifers?

Answer 8

1. Lake Erie
2. Yangtze River

Question 9

What is an aquifer?

Answer 9

A body of rock & or sediment that holds groundwater

Question 10

What is aquifer recharge?

Answer 10

The process by which rain water seeps down through the soil into an underlying aquifer