Trophogenic Zone- the upper part of the lake where enough light can get through to start photosynthesis
http://iws.collin.edu/biopage/faculty/mcculloch/2406/Notes/Aquatic%20Ecosystems/Lentic/Lentic.htm
http://www.nj.gov/dep/wms/bfbm/lakes.html
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Tropholytic Zone- The lower zone where no light can get to so no plants live there.
http://www.youtube.com/watch?v=HCwcADFOrSw&edufilter=mbbRbSiuWUQpoND2cW__0w
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