Which of the following can be natural sources of water pollution? a. volcanic activity b. earthquakes c. algae blooms d. all of the above

The answer is D.  Volcanic activity spews toxic gases such as Sulphur dioxide that ends up in the water bodies after precipitation. Earthquakes cause fractures in the earth’s crust (in at the beds of water bodies) from which gases such as methane could spew from deep in the crust. Algal blooms also make waters anoxic and when dense, can cause water discoloration and full of toxins.

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1. c 6. b. 11. c

2. a 7. d. 12. d

3. c 8. b. 13. c

4. d 9. c. 14. d

5. c 10. d. 15. a

16. d. 21. a

17. d.

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19. d. your own

20. d.