Seen from the blackness of outer space, Earth is clearly misnamed. With 70 per cent of its surface covered by water, our planet has a distinctive gem-blue colour when viewed from afar. Water - and the vast oceans in particular - makes Earth unique and turns this 'blue planet' into an oasis of life. Find out about the three major oceans - the Pacific, Atlantic and Indian - and about the two other major bodies of water that exist: the Arctic Ocean and the Southern Ocean.
In the first Blue Planet challenge, Journey to the Deep, you can explore some of the ocean's habitats and encounter an array of marine animals as you venture from a familiar rocky shoreline to the weird waters of the deepest abyss. You can find all the information you will need to complete the challenge in the dropdown fact files and infobursts.
Ten per cent of corals reefs are already destroyed with another estimated 60 per cent threatened and possibly to be lost in the next 50 years, if current trends in pollution, fishing practices and global climate change continue.