Topic 3- Pollution Indicators

Question 0

How are streams and rivers polluted?

Answer 0

1) chemicals from factories can leak into nearby water sources
2) heated water from factories leak into water sources. This boosts bacteria growth
3) acid rain can pollute fresh water

Question 1

What is eutrophication?

Answer 1

Sewage and fertilisers that wash through soil by rainfall leaking into streams and rivers

Question 2

Why is the pH of the water significant?

Answer 2

Living organisms can only survive at a narrow range of pH levels

Question 3

What is the name of species that enables us to identify pollution levels?

Answer 3

Indicator species

Question 4

What are the 3 ways scientists assess pollution?

Answer 4

Scientists check oxygen levels
Tests pH
Mathematical models to predict future effects