Name: _________________________ Block_____ Date__________



Name: _________________________ Block_____ Date__________

Biogeochemical Cycles WebQuest

Water Cycle Questions

Go to

1. What percentage of water on earth is in the ocean? _______________________

2. How much water is considered freshwater? ____________________

a. Why does this number alarm people about water quality around the world? ____________________________________________________________________________________________________________________________________

3. Most water cycling occurs through what three processes?

a. __________________________________________________________

b. __________________________________________________________

c. __________________________________________________________

-Click on the globe next to Evaporation-

4. What causes a typical hot and humid summer day in the Midwestern US? ________________________________________________________________________________________________________________________________________________

-Click the back button and click on the globe next to Transpiration-

5. What is transpiration? ________________________________________________________________________________________________________________________________________________

6. What 5 factors affect the rate of transpiration for a plant?

a. __________________________________________________________

b. __________________________________________________________

c. __________________________________________________________

d. __________________________________________________________

e. __________________________________________________________

Nitrogen Cycle Questions:

Go to

7. How is nitrogen present in the air? _________________________

8. Can most organisms use this form of nitrogen? ___________

9. In what forms can organisms use nitrogen?

a. ___________________________________

b. ___________________________________

c. ___________________________________

10. What are the 4 processes responsible for cycling nitrogen in nature?

a. _________________________________________

b. _________________________________________

c. _________________________________________

d. _________________________________________

11. Nitrogen fixation means to turn unusable nitrogen into its useable form. Click on the nitrogen fixation button to find out what type of organism can do this process. List ways nitrogen can be fixed:

a. _________________________________________________________

b. _________________________________________________________

c. _________________________________________________________

Oxygen Cycle Questions:

Go to

12. Read about oxygen and name 2 reasons why (other than breathing) oxygen is so important. _________________________________________________________

13. What is the chemical formula for ozone? _________________

14. What two processes cycle oxygen through plants and animals? ______________________________________________________________________

-Click on Carbon Cycle (left side of screen)-

Carbon Cycle Questions:

15. _______________________ is the most available form of carbon for living organisms.

Carbon cycle (continued)

16. What process removes 120 billion tons of carbon dioxide from the air per year? ________________________________________________________________________

17. What kinds of organisms can do this process? _______________________________

18. Name 2 processes that are putting excess carbon dioxide in the atmosphere.

a. _________________________________________________________

b. _________________________________________________________

Phosphorus Cycle Questions:

Go to files/cycles_phosphorus.html

19. Phosphorus starts its existence in ________________.

20. How does phosphorus get out of rocks? _______________________________________

21. How do animals get their phosphorus? _______________________________________________________________________

22. Why is the phosphorus cycle not really a “cycle”? _______________________________________________________________________

23. Where does the phosphorus end up? _________________________________

a. How does it get there? ____________________________________________________________________________________________________________________________________

24. What is the sudden concern with elemental phosphorus? ________________________________________________________________________________________________________________________________________________

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