At some convergent boundaries, an oceanic plate collides with a continental plate. Oceanic crust tends to be denser and thinner than continental crust, so the denser oceanic crust gets bent and pulled under, or subducted, beneath the lighter and thicker continental crust. This forms what is called a subduction zone.
For the water currents flow from the equator to the poles the presence of the unequal solar heating and the coriolis force exerted by the rotation of the earth is due to action to take place as the place in the surface of the earth is heated by the sun similar the water are driven by the winds to the east i.e the anticlockwise and to the south in the clockwise direction and this creates pattern of the cold and warm waters being drifted from the top to poles to the equatorial areas.
<u>This up-down movement created by the rotation is a significant life in the balance of the temperatures on the earth. </u>
<u>And hence creates a pattern of the movement of the warm and the cold current in the ocean that heats and respectively warm and cools the temperature of the coastal and with there respective periods.</u>
