Waves in the ocean are caused by the wind, while the tide is dependent on the moon

An ocean is an enormous, continuous body of salt water. The Earth contains five oceans, which cover approximately 70% of the surface. Oceans contain a large, diverse collection of the Earth's lifeforms.

The study of oceans is called oceanography.

## The World's Oceans[edit]

* Arctic Ocean
* Atlantic Ocean
* Indian Ocean
* Pacific Ocean
* Southern Ocean