Even more on oceans

http://www2.vims.edu/bridge/search/bridge1output_menu.cfm?q=pollution
http://smithsonianeducation.org/educators/lesson_plans/ocean/pollution/essay.html
http://water.epa.gov/learn/resources/

Oceans

A compendium of oceans resources:
http://www.nationalgeographic.com/xpeditions/lessons/07/gk2/wavesintro.html
http://www.teachervision.fen.com/oceanography/teacher-resources/6650.html
http://www.cloudnet.com/~edrbsass/edsci.htm
http://web.vims.edu/bridge/lesson.html?svr=www
Sustainable seafood: http://sanctuaries.noaa.gov/education/teachers/pdfs/sustain_seafood_lesson2.pdf
http://aquarius.uncw.edu/education/lessons.php
Concentration gradients: http://aquarius.uncw.edu/education/lessons/Aq%20Concentrate.pdf
http://www.pbs.org/newshour/extra/teachers/lessonplans/science/jan-june08/polar_oceanography.html
http://www.ncsu.edu/imse/4/lessons.htm

Earth Learning Ideas

Incredibly useful site for small to medium sized Earth Science lessons and activities:
http://aegsrv2.esci.keele.ac.uk/earthlearningidea/English/contents_English.html
http://earthlearningidea.blogspot.com/

The lessons are well explained and well researched. However, the resources are often lacking (ie. lacking in easy to use presentations).