Currents move clockwise or counterclockwise in different hemispheres because Earth spins on its axis.

Water that flows like a river on the top of the ocean.

When really cold or salty water sinks to the sea floor, pushing deep water to the surface.

Surface currents are caused mainly by the ______________.

In the Northern Hemisphere, water flows in a _____________ motion.

In the Southern Hemisphere, water flows in a _____________ motion.

Warm water is found near the _______________ because this is where the sun hits the Earth most directly.

Cold water is found near the ________________ because this is

where the sun does NOT hit directly.

In the poles, water becomes denser because________________.

Near the Equator, water becomes denser because ____________.

Convection causes hot water to ________________________.

Convection causes cold water to ______________________.

Another name for a density current is a _______________ current.

All the oceans on Earth put together is called the _______________.