Approximately 71 percentage of the earth is covered with oceans. Oceans are house for more than billions of organisms. Many organisms are yet to be discovered. Oceans provide livelihood to many families and is a major source of food supply.

A prominent question arises when we discuss about number of oceans . To be precise there is only one ocean and it is Global ocean . But when we consider ocean basins we can divide the global ocean to 5 categories.

1. Pacific ocean

2. Atlantic ocean

3. Indian ocean

4. Arctic ocean

5. *Southern ocean

Among these Pacific ocean is the largest ocean basin. Titanic tragedy occured at Atlantic ocean . Indian ocean is the only ocean with the name of a country. Artic ocean is situated near the poles which causes the accumulation of icebergs. On a whole , ocean is the major part of our world.