what is the difference between an ocean and a sea?
Key Difference: Oceans are large bodies of water that exist on the Earth. Oceans and seas are both bodies of water and these terms are often used interchangeably due to their lack of proper definition. Water bodies make up the hydrosphere that covers 71% of the Earth. Oceans and seas have slight differences among them.
A sea is a large body of saline water that may or may not be connected to an ocean, though commonly these are. However, the body is smaller compared to an ocean. It is believed to lack a natural outlet. Seas are usually located near land and are used to connect the land with an ocean.