1. BOTTOM RELIEFS OF THE PACIFIC OCEAN

2. Introduction
the largest ocean of the world having At million square kilometers (63.8 million square miles) in area.
the hydrosphere covers about 46% of the Earth's water surface and about one-third of its total surface.
It extends from east to west for 16,000 km from the east coast of Asia in the west to the west coasts of Americas in the east and for 14,880 km from north to south between Bering Strait in the north to Cape Adre (Antarctica) in the south.
The overall shape of the ocean is triangular.
Average depth of the ocean is 4,572 m. More or less uniform broad and extensive ocean floor is characterized by several swells, rises, sea mounts and depressions (trenches and deeps)

3. The Ocean has the, largest number of islands (more than 2,000).
These continental shelves also carry numerous marginal seas like Bering Sea, Okhotsk Sea, Japan Sea, Yellow Sea, China Sea, Java Sea, Coral Sea, Tasmania Sea and Arafura Sea.
The islands of the Pacific Ocean are grouped in the following 3 categories:
The continental islands: Aleutian Islands, islands off British Columbia of Canada and Chilean islands.
Islands arcs and festoons: Kurile, Japanese y Archipilago, Philippines, and Indonesian Islands.
Scattered smaller islands :
Malanesia: e.g. Solomon’s, New Hebrides, Fiji.
Micronesia: e.g. Marshalls, Carolinas, Gilbert, and Ellice.
Polynesia: e.g. Society, Cook and Tuamotu.

4. East Pacific Rise
The Pacific Ocean does not have central or mid-oceanic ridge like the Atlantic and the Indian Oceans, albeit there are a few scattered ridges having local importance.
The East Pacific Rise or Ridge known as Albatross Plateau is 1600 km wide and it extends from north of New Zealand to the Californian coasts.
It has also been formed due to divergent plate movements and sea floor spreading.

5. Ocean Basins
The equator subdivides it into the North Pacific Ocean and South Pacific Ocean.
Philippine basin is located to the east of Philippines and extends from south of Japan to 5°N latitude.
Fiji basin is located to the south of Fiji Island between 10°S and 32°S latitudes and the average depth is 4,000m.
East Australian basin is situated between the east coast of Australia and New Zealand Ridge with average depth of more than 5,000m.
South Australian Basin also known, as Jeffreys Basin is located to the south-east of Australia having average depth of 5,000m.
Peru basin in located to the west of Peru coast between 5°S and 24°S latitudes
South-Western Pacific basin is an elon­gated basin stretching between 20°S and 50°S latitudes and °W longitudes.

6. Oceans Deeps and Trenches
There are several trenches and deeps in the Pacific Ocean.
These depressions are located either along the island arcs or mountain chains.
the trenches are found mainly in the western Pacific Ocean.
The Mariana Trench in the western North Pacific is the deepest point in the Pacific and in the world, reaching a depth of 10,911 meters (35,797 ft).