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Name ________________________

Date _____________ Period_______

Biogeochemical Cycles

Use your notes to help you

1. Name the biogeochemial cycles: _____________, ________________, ______________, ______________

2. Most of the Earth’s carbon is found in what form? _______________________

3. How have humans increased the speed of global warming? ________________________________________

4. In what 2 places is most of the Earth’s carbon dioxide located? _____________________________________

5. Does phosphorus ever enter the atmosphere? ____________________

6. Name 2 natural substances that contain phosphorus. ______________________________________________

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7. How does phosphorus get into lakes and streams? ______________________________________________

8. Define nitrogen fixation.

9. Define denitrification

10. Which 2 nutrients are found in fertilizers? ____________________________________________________

11. A sudden growth of algae is called an _____________________________

12. When algae blooms in a pond and then dies bacteria decompose it and use up all of the oxygen. This causes fish and amphibians in the water to die. What is the scientific term for this occurrence? ___________________

13. Tell which cycle the following words relate to.

A. Legume (beans) ______________

B. evaporation ___________

C. seepage (percolation) ______________

D. decomposition ___________

E. algal blooms _______________________

F. denitrification ______________________

G. transpiration _______________________

H. burning fossil fuels ___________________

I. condensation ________________________

J. photosynthesis _______________________

K. runoff _____________________________

L. nitrogen fixation _____________________

M. respiration ___________________________

N. ammonification _______________________

O. rocks and minerals ___________________

P. assimilation _____________________

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