The temperature and salinity of seawater affect its density, which influences ocean circulation. The combination of these factors along with atmospheric circulation, dictate how ocean currents flow around the world. Another factor that is crucial in moving water throughout each ocean basin is the rotation of the earth. In this video, Julius Busecke explains how this works and what it means for something like gyre formation in the North Atlantic Ocean. To learn more about these idea, visit the original webinar page at cosee.umaine.edu/coseeos/spurs/webinars_04.htm.