All the seas and oceans together occupy more than 2/3 of the Earth's surface. Water shell of the Earth is called the World ocean.
The ocean is not solid, continents and large Islands divide it into several oceans.
It is considered that on the globe four oceans: Pacific, Atlantic, Indian, and Arctic.
But in 2000, the international hydrographic organization has decided to allocate part of the Atlantic, Indian and Pacific fifth ocean surrounding Antarctica is the southern (or Antarctic) ocean. The border held by the 60th parallel of the southern hemisphere.
The largest of the oceans - the Pacific. Its area is 178,7 million km2. He is also the deepest ocean in the Mariana trench, which extends from the South-East of the island of GUAM to the North-West of the Mariana Islands, its depth is 11034 m In the Pacific ocean is the highest underwater mountain - Mauna Kea. It rises from the ocean floor and protrudes above the surface of the water in the Hawaiian Islands. Its height - 10205 m, i.e. it is higher than even the highest in the world mount Everest, although its peak rises above sea level, just 4205 m
The Atlantic ocean stretches 91.6 million km2.
The area of the Indian ocean is 76.2 million km2.
The area of the Antarctic ocean - 20,327 million km2.
The Arctic ocean covers an area of approximately 14.75 per million km2.