It does not
A Sea is smaller than an Ocean.
Large bodies of salt water are called seas or oceans.
sea
All else being equal cold water is more dense than warmer water. The Arctic Ocean, being colder, would be more dense.
Mediterranean Sea to the south and the Atlantic Ocean on the Northwest and Southwest
Oceans are continuous bodies of water that cover most the Earth's surface, A sea is a region of water withing an ocean, partly enclosed by land. Such as the North Sea. A sea can be a large body of either fresh or salt water completely enclosed by land. Such as the Caspian Sea
Sea water contains lots of dissolved salts. Thus the density of the salty sea water is more than that of water in swimming pools, and the salty water lifts you more than fresh water, which make swimming easier.
The Artic Ocean is more salty than oceans further south because when sea water freezes salt gets left behind in unfrozen water .
a sea
A sea.
no
Oxygen is more soluble in fresh water than it is in sea water, therefore there is more dissolved oxygen in river water than sea water.