HI Friends , this is Kaajal , I think this PPT is usefull

1. OCEAN
CURRENTS

2. INTRODUCTION
• CURRENTS : A Body of water or air moving in a
definite direction, especially through a surrounding body
of water or air in which there is less movement is called
currents .
• OCEAN CURRENTS : The Continuous, predictable,
directional movement of seawater driven by gravity, wind
and water density .

3. OCEAN
CURRENTS

4. OCEAN CURRENTS
An ocean current is a continuous, directed movement
of sea water generated by a number of forces acting
upon the water, including wind, the Coriolis effect,
breaking waves, temperature and salinity
differences. Ocean currents act much like a conveyor
belt, transporting warm water and precipitation from
the equator toward the poles and cold water from the
poles back to the tropics. Thus, ocean currents regulate
global climate, helping to counteract the uneven
distribution of solar radiation reaching Earth's surface.

5. People have used ocean currents to explore the
Earth. Ocean currents affect the shipping industry,
commercial and recreational fishing, and recreational
navigation for boats . Ocean water is saline because ,
Salt in the ocean comes from two sources: runoff from the
land and openings in the seafloor. Rocks on land are the major
source of salts dissolved in seawater. Rainwater that falls on
land is slightly acidic, so it erodes rocks. ... Ocean water seeps
into cracks in the seafloor and is heated by magma from the
Earth's core . The largest ocean current is the Antarctic
Circumpolar Current . The Antarctic Circumpolar Current is
the only ocean current to circle the planet and the largest wind-
driven current on Earth. It's also 30% more powerful than
scientists realized.

6. TYPES OF OCEAN CURRENTS
COLD
OCEAN
CURRENTS
WARM
OCEAN
CURRENTS

7. COLD OCEAN
CURRENT
• Cold ocean currents flow
toward the equator on the
eastern side of ocean basins.
Examples of cold ocean
currents include the Canary
Current in the North Atlantic,
the California Current in the
North Pacific, and the
Benguela Current in the South
Atlantic. Cold currents can
also flow out of far northern
regions.
WARM OCEAN
CURRENT
• Warm ocean currents flow
away from the equatorial
region on the western side
of ocean basins. The Gulf
Stream in the North Atlantic
and the Kuroshio Current in
the North Pacific are examples
of warm currents. Of all
the warm currents, the Gulf
Stream has been studied most
extensively.

9. FORMATION OF OCEAN CURRENTS
• Ocean currents can be caused by wind, density
differences in water masses caused by temperature
and salinity variations, gravity, and events such as
earthquakes or storms.
• These currents move water masses through the
deep ocean taking nutrients, oxygen, and heat with
them.

10. WORK OF OCEAN
CURRENTS
•Ocean currents are driven by a range of
sources: the wind, tides, changes
in water density, and the rotation of the
Earth. The topography of the ocean floor and
the shoreline modifies those motions,
causing currents to speed up, slow down, or
change direction.

11. WHY ARE OCEAN CURRENTS ARE
IMPORTANT
• By moving heat from the equator toward the
poles, ocean currents play an important role in
controlling the climate. Ocean currents are also
critically important to sea life. They carry nutrients
and food to organisms that live permanently attached
in one place, and carry reproductive cells
and ocean life to new places.

12. BY :M.KAAJAL