Biology

Difference Between Ocean and Sea

The difference between sea and ocean is not usually known to most people and this is the reason why they call these two names for the same thing. While there is a big difference between them and what it takes is a small study to help distinguish between them. The basic difference between ocean and sea is that the oceans are usually smaller than the oceans and are often where they meet the land with the ocean. The seas are closed, whereas the oceans are open and have greater depth. The ocean and sea correspond to the liquid masses of planet Earth that cover the continents, rivers, lakes, and lagoons. Both are formed by large portions of salty water and cover about 73% of the earth’s surface.

Overview

the oceans have an immense surface of saltwater with ocean currents and great depths. while the seas are masses of salty water, of less depth and size, located between the land and the oceans. Also, there are seas as large salty lakes, for example, the Caspian Sea, Dead Sea, Aral Sea, etc.

On contrary, in relation to the depth, it also influences the temperature. In the oceans, the temperature is lower, about 4 degrees anywhere. For their part, the seas being closer to the land receive solar radiation, and temperatures can vary, for example: in the Caribbean or the Mediterranean Sea the waters are warm and in the North Sea they are colder.

The most important difference that exists between the oceans and seas is that the seas are much smaller and they belong to the oceans, they are part of them. Seas are the parts of the oceans closest to Earth. We all know that there are 5 oceans on our planet and their names are listed below

  • The Atlantic
  • The Pacific
  • The Indian Ocean
  • The Arctic
  • The Antarctic

The Arctic Ocean is the smallest ocean, and the Pacific Ocean is the largest ocean in the world.

See also: What are the 2nd and 3rd largest oceans in the world?

What is an Ocean?

The ocean is actually a very large expanse of saltwater covering three-quarters of the surface of this earth. They are always bordered by continents or the equator or there may be another binary equator. There are seven major oceans in the world that are listed above. The oceans can never be called seas because there is a big difference between them.

What is the Sea?

A sea is the large expanses of salty water that may or may not be connected to an ocean, while it usually is. They are generally smaller than the oceans and are shallower than the oceans. The seas do not usually have natural outlets and are close to the Earth. They usually connect the land to the oceans. Unlike the oceans, its waters form waves. An ocean like the Caspian Sea can also be a part of it and the Dead Sea is known around the world as the largest saline lake around Earth. Do you know how many seas there are? There are many popular seas in this world and their names are listed below

  • The Mediterranean Sea
  • The Caribbean Sea
  • The Dead Sea
  • The Red Sea
  • The Baltic Sea
  • The Bering Sea
  • The North Sea
  • The Coral Sea
  • The Black Sea
  • The Yellow Sea etc.

See also: Important seas of the world and their areas (for general knowledge)

However, the largest seas in the world include the Caribbean Sea, the South China Sea, and the Mediterranean Sea.

Difference Between Ocean and Sea In Tabular Form

Ocean

Sea

It covers about 70% of the earth’s total surface. The ocean is made up of salty water. It is also made up of salty water while is smaller in size compared to oceans.
Oceans are not necessarily located close to land. Seas are usually located close to land.
They have reduced aquatic life as it is far away from the land and deeper than the Seas. Aquatic life exists in abundance in seas. Usually, seas are located close to the land.
The marine life may be confined to bacteria, shrimp, microscopic planktons. For photosynthesis, this is due to lack of penetration of sunlight deep into oceans thus not giving much scope. Marine life is large in quantity in the seas. While sunlight is able to penetrate deeper into the seas, allowing photosynthesis.
There are 5 oceans on our planet and their names are listed below

  • The Atlantic
  • The Pacific
  • The Indian Ocean
  • The Arctic
  • The Antarctic
The names of seas are listed below:

  • The Mediterranean Sea
  • The Caribbean Sea
  • The Dead Sea
  • The Red Sea
  • The Baltic Sea
  • The Bering Sea
  • The North Sea
  • The Coral Sea
  • The Black Sea
  • The Yellow Sea etc.
The Deepest Ocean is the Pacific Ocean that is around 10,000 meters deep and the Arctic Ocean is around 5600 meters deep. The deepest sea is the Caribbean Sea with an approximate depth of 6900 meters.

Key Differences b/w Oceans and Seas

  • The seas are smaller than the oceans.
  • The oceans have lower temperatures than the seas.
  • The oceans reach greater depths.
  • Sea is also made up of salty water while smaller in size compared to oceans.
  • The seas have greater biodiversity in the number of species than the oceans.
  • The oceans are home to fewer species but are more adapted to the depths and low temperatures.
  • The seas are more exposed to environmental pollution than the oceans and, as a consequence, to higher species mortality.

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