Biogeochemical cycling involves three primary steps: _____, _____ , and _____.

DRAW IT Identify where the following processes occur: ammonification, decomposition, denitrification, nitrification, nitrogen fixation. Name at least one organism responsible for each process.

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Potable water is allowed to have ________coliforms per 100 ml of water tested.

Nitrification converts _____.

a. organic nitrogen to NH3

b. NH3 to NH4+

c. NH4+ or NH3 to NO3

d. NO3 to N2

Anammox reactions are

a. anaerobic and part of nitrogen cycling

b. anaerobic and part of carbon cycling

c. aerobic and part of sulfur cycling

d. aerobic and part of metal ion oxidation

Label the general phases in the carbon cycle. <IMAGE>

Label the processes of the nitrogen cycle. <IMAGE>

Which of the following is a beneficial activity of microorganisms?

Which of the following is an example of bioremediation?