Deeper, Darker, Colder

A handy chart describing the different light zones can be found on the NOVA site at http://www.pbs.org/wgbh/nova/teachers/viewing/0305_04_nsn.html. In addition to describing each zone, examples of the different types of organisms that can be found at each level are listed. An interesting note is that the Frill Shark (see post "From the Past...") is listed in the "Midnight Zone" where at 1000-4000m no light from the surface can be seen, leaving the waters in total darkness.