How Plants Produce Food

• how it works,
• who uses the system
• advantages and
• disadvantages

http://www.hydrogarden.com/index2.html

http://www.foothillhydroponics.com/brochure/5ws.htm

http://www.hydroponics.com/info/scienceprojects.html

http://www.pcs.k12.va.us/schools/ths/aquaponics.htm