"From sunlit surface water that teems with life to the deepest, darkest depths filled with some of Earth's most unusual creatures, oceans are home to a wide array of life. Peel back the corners of the ocean to find out what fascinating life exists within this ecosystem, from Earth's biggest animal, the blue whale, to tiny organisms, such as kelp. Discover where the world's oceans are and what you can do to help protect our planet's rich waters."

What is an ecosystem? -- Energy in ecosystems -- Oceans of ecosystems -- In the zone -- Where the sun doesn't shine -- Icy waters -- Temperate oceans -- On the rocks -- Tropical oceans -- Coral reefs -- Sandy shores -- Ocean forests -- Sink or swim.