1. Google Nitrogen Cycle
2. Study several websites and graphics discussing this topic
3. Decide what is important about Nitrogen (N) cycles
4. Write study guide questions, multiple choice, true/false, or matching about N cycles
    

http://www.physicalgeography.net/fundamentals/9s.html

http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/nitrogencycle.html

http://en.wikipedia.org/wiki/Nitrogen_cycle

and

interesting

and

relevant

and

http://news.bbc.co.uk/2/hi/science/nature/6108414.stm

http://news.bbc.co.uk/2/hi/europe/6114962.stm

http://news.bbc.co.uk/2/hi/uk_news/england/wiltshire/6112476.stm

http://news.bbc.co.uk/2/hi/science/nature/6108090.stm

http://news.bbc.co.uk/2/hi/science/nature/6111528.stm

http://www.ucsc.edu/news_events/press_releases/text.asp?pid=971

http://www.care2.com/news/member/525634130/212599

ecosystems sites 

food web:  http://oceanlink.island.net/oinfo/foodweb/foodweb.html

http://www.oceansonline.com/oceanicfoodwebs.htm

http://www3.umassd.edu/Public/Exhibit/DES300/game/web-fr.htm

http://octopus.gma.org/surfing/human/foodweb.html

online build an african web: http://www.vtaide.com/png/foodchains.htm

food chain:
http://www.planetpals.com/foodchain.html

http://www.geography4kids.com/files/land_foodchain.html

e-waste

tuna

UK birds

http://news.bbc.co.uk/2/hi/science/nature/6187228.stm

http://news.bbc.co.uk/2/hi/science/nature/6185548.stm

http://news.bbc.co.uk/2/hi/science/nature/4815230.stm

http://news.bbc.co.uk/2/hi/science/nature/6041570.stm  Venus

1. Changes in Systems
2. Properties of Systems
3. Structure of Systems

Science/Nature various
http://news.bbc.co.uk/1/hi/sci/tech/default.stm

http://birds.cornell.edu/programs/AllAboutBirds/BirdGuide

http://birds.cornell.edu/programs/AllAboutBirds