Sea – Covers more than 70 % of the earths surface with water
Sea, the middle depth of all oceans are 3800 meters (12467ft) and the biggest depth is 10971 meters (35994ft) and lies in the challenger depth of the Mariana.
Scientists say that life started in the oceans were for example fish got legs and started walking on earth. The biggest living species in the sea is the blue whale and it is also the biggest species of all species on earth. It can have a lenght about 30 meters (98ft) and weigh 200 ton.
Oceans store alot of carbon that emits from human activity lika transportation and industries. It suppresses the global warming but when more and more carbon are stored in the oceans will be more sour. It can effect the eco system like corals, shellfish and plankton.
(1) (http://en.wikipedia.org/wiki/Sea , 17 april 2013)
(2) (http://en.wikipedia.org/wiki/Blue_whale , 17 april 2013)
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