Upwelling is caused when strong wind blows along the coast. When this happens the winds push the water away on the ocean’s surface. Water then rises up from beneath the surface to replace the water. This is called upwelling.
Upwelling is most common along the west coast of continents (eastern sides of ocean basins)
For more relevant articles refer to the links given below:
- UPSC Environment and Ecology Questions
- United Nations Environment Programme
- UPSC Environment and Ecology