That part of seawater that systematically moves from one place to another place in a fixed direction, is known as current. In fact, these are the reverse of hot and cold water flowing inside the sea.
The reasons for currents are as follows:
- The Winds. Routine winds always flow in the same direction. They make the seawater also flow alongside. Thus the currents take place.
- The difference in Temperature. The temperature is more in equatorial regions. Because the seawater expands and moves towards the polar region. On the other side, the polar regions have low temperatures and the water there starts moving towards the equator inside the sea. Thus currents are created.
- The difference in Salinity. There are so many salts mixed in seawater. The water which has more salts it becomes heavy and starts going down the sea. To take its place the water with less salt, which is lighter, starts flowing towards the heavy salt side, so the currents take place.
- Formation of Continental Coasts. The currents flow along the Continental Coasts. So the formation of continental coasts gives new direction to the currents. With every change of direction, a new current is born.
