Seamount
The peaks are often found hundreds to thousands of metres below the surface, and so are in the deep sea. There are an estimated 100,000 seamounts around the globe, but only a few have been studied. Seamounts come in all shapes and sizes, and follow a distinctive pattern of growth, activity, and death. In recent years, several active seamounts have been observed, for example Loihi seamount in the Hawaiian–Emperor seamount chain.