Kelp Forests are dense aquatic forests made up of seaweeds and kelp. The forests are mainly made up of two types of kelp; Giant Kelp (Macrocystis pyrifera) and Bull Kelp (Nereocystis leutkeana). Kelp Forests grow along rocky coastlines in depths of about 2 meters to more than 30 meters (6–90ft) and light is needed to reach the kelp so it can photosynthesis and grow. Kelp thrives in areas with constant upwelling and cool, high nutrient waters. It also needs a rocky structure to root onto as well as animals to balance the environment. The Kelp Forest is said to be one of the most productive and dynamic ecosystems on Earth.