stream of water that moves in a definite direction through an ocean.

wind-powered ocean current that moves the upper few hundred meters of seawater.

current caused by differences in density of ocean water that flows deep below the surface.

a constantly moving system of deep-ocean circulation driven by temperature and salinity.

the amount of mass in a given volume. 

the total amount of dissolved salts in water.

a climate event that occurs every two to seven years in the Pacific Ocean, during which winds shift and push warm water toward the coast of South America.

a climate event in the eastern Pacific Ocean in which surface waters are colder than normal.

the movement of deep, cold, and nutrient-rich water to the surface.

a warm ocean current that flows from the Gulf of Mexico northward through the Atlantic Ocean.

a cool Pacific Ocean current that moves south along the western coast of North America.