difference between sea and ocean?

Answer 1

Although the terms "ocean" and "sea" are often used interchangeably, a sea is generally considered to be smaller than an ocean. One definition of "ocean" is: a great body of interconnecting salt water that covers 71 percent of the Earth's surface. There are four major oceans—Arctic, Atlantic, Indian, and Pacific. However, some sources do not include the Arctic Ocean, calling it a marginal sea. The term "sea" is often assigned to saltwater areas on the margins of oceans, such as the Mediterranean Sea situated beside the Atlantic Ocean.

A sea is either a large expanse of saline water connected with an ocean, or a large, usually saline, lake that lacks a natural outlet such as the Caspian Sea and the Dead Sea. The term is used colloquially as synonymous with ocean, as in "the tropical sea" or "down to the sea shore", or even "sea water" to refer to water of the ocean. Large lakes, such as the Great Lakes, are sometimes referred to as inland seas. Many seas are marginal seas, in which currents are caused by ocean winds; others are mediterranean seas, in which currents are caused by differences in salinity and temperature.

The International Hydrographic Organization (IHO) is the world authority when it comes to defining seas. The current defining document is the Special publication S-23, Limits of Oceans and Seas, 3rd edition, 1953. The second edition dated back to 1937, and the first to 1928. A fourth edition draft was published in 1986 but so far several naming disputes (such as the one over the Sea of Japan) have prevented its ratification.

Some bodies of water that are called "seas" are not actually seas; there are also some seas that are not called "seas". The following is an incomplete list of such potentially confusing names to use as examples.

The Sea of Galilee is a small freshwater lake with a natural outlet, which is properly called Lake Tiberias or Lake Kinneret on modern Israeli maps, but its archaic name remains in use.
The Sea of Cortés is more commonly known as the Gulf of California.
The Persian Gulf is a sea.
The Dead Sea is actually a lake, as is the Caspian Sea.

I hope you find this information useful and helpful.

Cheers :-)

Answer 2

Sea is a division of an ocean or a large body of salt water partially enclosed by land.
While,
Ocean is a large body of water constituting a principal part of the hydrosphere.

Answer 3

Oceans are the largest uninterrupted expanses of water. Seas are smaller lobes of the ocean that are partly surrounded by land.

Answer 4

An Ocean is much larger.

Answer 5

I don't know that and I don't really know the difference between an Alligator and Crocodile. Guess I should have watched the Croc Hunter more often!