There are different type of oceans around the world, and the physical geography is different that changes the temperature and climate. Some area has trench, seamount, large basin/gulf, where the water is warmer. The largest Pacific Ocean and the Atlantic Ocean have large trenches and basin, the water is more dense. Upwelling in ocean allows cold to the surface, and nutrients that supports marine communities. Regular upwelling is very important for healthy marine communities. The Mascareigne region is cooler, because of the regular upwelling in the Indian Ocean. Tropical water in the Mascareigne has abundant plankton that supports a diverse marine ecosystem in the ocean and Antarctica. Plankton is very important in ocean to protect marine environment.