Sea Life

The World’s Oceans & Marine Life

Water covers about 70 % of the total Earthy surface, most of these water bodies are in the form of extended oceans which covers about 97% of the total world’s water while the other may include rivers, lakes, bays, and estuaries. The world of the ocean has been changing drastically and has evolved. Scroll down!

How Many Oceans Are There On The Planet?

5 big oceans are distributed all over the globe, all are connected forming a massive water body called as Global ocean. these oceans are:

  • The Arctic Ocean
  • The Southern Ocean
  • The Indian Ocean
  • The Pacific Ocean
  • The Atlantic Ocean
Four oceans on the planet earth

How Does Life Come Into Being In Oceans?

According to the historical background, life in the ocean have been evolved for more than 3 billion years ago. The studies suggested that the first life form which exists in the ocean is the microscopic organisms that are not visible to the naked eye. Later, other creatures such as whales, sharks, and octopuses shared the history of roaming in the ocean for a long time. Some species went extinct whereas others have adapted to the changing environmental conditions and are living up till now.

How Deep The Oceans Are?

The depth of the ocean depends upon the tectonic plates. The measurements of the depth of all the oceans are given below:

  • The depth of the Arctic Ocean measures about 5,450 meters.
  • The Southern Ocean measures about 7,236 meters
  • The Pacific Ocean is about 11,022 meters deep.
  • The Indian Ocean measures about 7,258 meters in depth.
  • The Atlantic Ocean is 8,486 deep.

To Ocean Why Coral Reefs Are Important?

Coral reefs are the nurseries and the major hotspot of biodiversity under the water where there is a large number of marine life exists. The largest coral reef is found in the Pacific Ocean which extended to about 2,300 km and supports the highest marine life as compared to the other oceans.

Coral reef

On An Average, How Many Species Lives In The Ocean?

According to the studies, approximately, 243,000 species live under the water in the extended ocean – which accounts for 16% of the total animals discovered on the Earth up till now. Depending upon environmental conditions such as temperature and climate change, marine species adapt to a wide range of habitats.

Which Species Lives In The Ocean?

The ocean is hometown to a diversified marine species as the warm and tropical waters are the first preference of oceanic animals such as sharks, lobsters, crabs, fishes, whales, dolphins, seals, eels, sea lions, and many others. Well, among all, the biggest species of the oceanic realm are blue whales which are found living in almost all oceans.

Marine species living in the ocean

What Temperature Does Ocean Have?

Temperature is the most prominent feature which allows the species to adapt to a particular habitat. Overall, the temperature range of the ocean water lies as low as – 2 oC or 28 °F and as high as 28 °C or 82°F. However, the temperature of the ocean water gradually increases due to climatic change which in turn increases the temperature near the sea level.

Do World Oceans Are Beneficial For The Humans?

Not only for marine life, but the oceans of the world also provide many benefits to the human, such as:

  • It regulates the weather and climatic factors.
  • It provides about half of the world’s oxygen which we breathe.
  • It allows trading and transportation.
  • It provides food that human enjoys the most such as seafood.
  • Medicines against certain diseases such as cancer, skin diseases, and heart problems, come from the ocean.

 Final Words

Water covers about 70 % of the Earth, and about 97 % of it exists in the oceans. There are 5 largest oceans in the world, the Arctic, Atlantic, Southern, Pacific, and Indian Oceans. The oceans support a large amount of marine life because of the suitable water temperature and the abundant availability of food. Not only marine animals, but the oceans are also beneficial to humans.

About the author


I am a Scholar and a dedicated content writer. I am on a mission to stamp out the importance of one of the ocean's most fascinating and remarkable creatures, the sharks, and to let people know about their role in keeping the ecosystem in equilibrium.