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. | 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. |