Pocket Eyewitness Ocean

"Immense shoals of barracuda, forests of giant kelp and the world's largest volcano - these are just a few of the majestic sights in the world's oceans.
Our seas are by far the largest habitat on Earth and are home to an astonishing 90 per cent of the world's biodiversity. Life itself began in the oceans and has proliferated to include innumerable numbers of marine species, from single-celled archaea to giant manta rays, sea turtles and blue whales.