This is because air above the warm currents is warm which contains water vapour. When this warm current meet the cold current, the air above the cold current, causes the water vapour of the warm current to condense into tiny particles which form fog.

There are two type of Ocean Currents:

• Surface Currents–Surface Circulation.
• Deep Water Currents–Thermohaline Circulation.
• Primary Forces–start the water moving.
• The primary forces are:
• Secondary Forces–influence where the currents flow.
• Solar heating cause water to expand.

Two types of ocean circulation

• Equatorial currents. At the Equator the currents are for the most part directed toward the west, the North Equatorial Current in the Northern Hemisphere and the South Equatorial Current in the Southern Hemisphere.
• The subtropical gyres. The subtropical gyres are anticyclonic circulation features.
• The subpolar gyres.

• Beaufort Gyre – A wind-driven ocean current in the Arctic Ocean polar region.
• Indian Ocean Gyre – A large systems of rotating ocean currents.
• North Atlantic Gyre – A major circular system of ocean currents.
• North Pacific Gyre – A major circulating system of ocean currents.

Explanation: The main reason by which the ocean currents are formed is the rotation of earth. The earth rotates on its own axis and due to this reason there is a huge mixing of the water from the equator and poles which is termed as ocean currents. Ocean currents are important as it controls the global temperature.

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. Currents are cohesive streams of seawater that circulate through the ocean.

People have used ocean currents to explore the Earth. Ocean currents affect the shipping industry, commercial and recreational fishing, and recreational navigation for boats. Having updated information on currents is directly related to how safely people can dock or navigate along coasts.

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.

The effects of ocean currents are: Affect Temperatures: Currents influence the climatic conditions of the regions in which they flow. The warm Equatorial currents raise the temperature of the region in which they flow. Similarly, the cold currents lower the temperature of the places where they flow.