Step-by-step explanation:
Upwelling is a oceanographic phenomenon. It is a process which results in the replacement of warm and nutrient less water with the cold and nutrient enriched water at the surface of oceans, seas, etc. As a result of this process, the surface water rises. The phenomenon behind this process is that the high intensity winds move the cold water from the middle of the ocean or sea towards the surface of the ocean or sea replacing the warm water which was present there. Due to this process, the nutrient enriched water reaches the surface of the oceans and seas.