The hydrosphere, including
all the water on the planet, is constantly moving. This motion on a grand
scale is called current. Current is caused by differences in temperature,
differences in salinity, the motion of the Earth, and wind.
Water moves in large circles around the oceans. When water
is near the hot equator, the water is warmed by the Sun. It carries this
warmth with it toward the north and south poles, where it cools, and begins
the process again.
Currents Map with Labels (78 k)
- Is there an ocean near your home town? Is the water there cool or warm?
- If you go swimming in an ocean, can you feel a current moving you in
one main direction?
- How do you think the world would change if there were no current?
- Look at this map (78 k). Which
oceans are mainly warm? Which are mainly cold?
A-Z Index | Add
an Idea | Maps | Student
Projects | Teacher's Guide