Nitrogen Cycle

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Carbon Cycle: Visit the following web site and complete the information requested.
http://www.sciencelearn.org.nz/Contexts/The-Ocean-in-Action/Sci-Media/Animations-and-Interactives/Carbon-cycle
Please explain what role each of these parts play in the cycling of Carbon.
1. Burning Fossil Fuels
2. Respiration
3. Photosynthesis
4. Vegetation
5. Weathering Run Off
6. Carbon dioxide exchange
7. Phytoplankton
Nitrogen Cycle: Visit the following web site and complete the information requested.
http://www.classzone.com/books/ml_science_share/vis_sim/em05_pg20_nitrogen/em05_pg20_nitrogen.swf
http://www.pbslearningmedia.org/asset/lsps07_int_nitrogen/
1. What can fix N2 into usable NO3?
2. What absorbs the NO3 and uses the nitrogen to form other nitrogen compounds?
3. What is in the soil and root nodules that allow the N2 to form other nitrogen compounds?
4. Why do organisms need nitrogen to survive?
More on Nitrogen Cycle: http://www.picse.net/CD2011/nitrogen-cycle/index.html
Phosphorus Cycle:
http://www.shmoop.com/ecology/phosphorus-cycle.html
http://www.wadsworthmedia.com/biology/starr_udl11_tour/phos_anim.html
1. Why do organisms need phosphorus?
2. How does usable phosphates make its way into the soil?
3. What cycle is important in order for the terrestrial phosphorus cycle to take place?
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