Ocean Currents

http://en.wikipedia.org/wiki/Ocean_current
http://seawifs.gsfc.nasa.gov/OCEAN_PLANET/HTML/oceanography_currents_1.html
http://earth.usc.edu/~stott/Catalina/Oceans.html
http://oceancurrents.rsmas.miami.edu/
http://oceanservice.noaa.gov/education/tutorial_currents/
http://geography.about.com/od/physicalgeography/a/oceancurrents.htm
http://education.nationalgeographic.com/education/activity/mapping-ocean-currents/?ar_a=1