The document discusses various types and causes of water pollution. The two main causes are industrialization and population growth. Water pollution can come from point sources like industrial outflows or non-point sources like agricultural runoff. Common pollutants include chemicals from factories or fertilizers, sewage, and thermal pollution from power plants. Water pollution is difficult to address and can seriously harm aquatic life and contaminate drinking water sources.

1. Water Pollution

4. Give an example of a polluted water source that you know. Do you know of a local polluted water source?

7. Name a local point source of pollution and non-point source of pollution

10. What kind of pollutants can you find in sewage sludge?

13. How else can algae blooms reduce the amount of dissolved oxygen in a body of water?

18. Do you think that having a polluted river or a polluted aquifer is a bigger problem?

21. Why is pollution from the land so much worse than pollution from an oil tanker?

23. Which do you think is the larger problem – freshwater pollution or ocean pollution?