Ocean and Sea are the largest bodies of water know the landmass. As thought by geography, a sea is not as big as an ocean. As a matter of fact, an ocean is a combination of seawater bodies. Even the largest sea which is the Mediterranean Sea of about 1,144,800 square miles in total area is smaller than the largest ocean with is the Arctic ocean of about 5,427,000 square miles in total area.
In addition, oceans are usually lower in-depth than the sea, probably because the sea is closer to the land. The closer part of the sea to the land can also allow for the survival of some plants and animals, while only a few organisms can survive in the ocean. The pressure in the ocean is higher than that of the sea, and the ocean is very with the absence of any sunlight penetration. There exist only five oceans in the whole wide world, while there are actually dozens of sea bodies around the world.