Almost three quarters of the earth’s surface is covered in water and around 90% of all the living space on Earth is contained in the oceans.
These vast reserves cradled early life and continue to be home to a wealth of extraordinary creatures. At least 230,000 unique species have been documented, although as humans have only explored a small fraction of the depths, there may be as many as two million.
As well as being home to everything from whelks to whale sharks, the oceans offer a range of critical services, including acting as a source of food and regulating the atmosphere.
See full Article and video: http://www.bbc.com/future/story/20130129-blue-heart-of-the-planet
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