Ocean hills yield secret ecosystems

摘要

A treasure trove of biodiversity has been hiding several kilometres below the ocean surface. Only a handful of people have ever seen these enigmatic animals - until now. We tend to think of the seafloor a few kilometres down as a flat plain. In fact, about two-thirds of this "abyssal" seabed is made up of gentle rolling hills a few hundred metres high, says Jennifer Durden at the University of Southampton, UK.