When and How Were the Oceans Formed

The surface of the earth, as we know now, is covered with three fourths of water. This comprises of the oceans, seas, rivers and lakes. We really do not know how these water bodies were formed. The scientists have propounded the theory that as the earth cooled it was enveloped by thick clouds. These clouds rained down water on the earth.

However the surface of the earth was still very hot and the water would evaporate and go back to the atmosphere. This again would come down as rain. This cycle continued for millions of years till finally the earths surface cooled. The heavy rains then filled the hollows and low-lying areas in the crust. As the continents drifted apart due to the movements of the mantle below, more depressions were caused. The rain gradually filled them to form the present day oceans and seas. It has been estimated that the oceans were formed about 500 to 1000 million years ago. This calculation has been based on the age of the minerals found in them.

The oceans are very interesting in that they reveal the past history of the earth to us. If we study the bottom of the oceans we can see a variety of land formations. Much of the landscape consists of flat plains. However in certain areas, the ocean floors have hills, mountains, valleys, valleys, volcanoes, trenches and ridges. At the edge of the continents there is a hollow shelf which slopes gradually and then dips steeply of the plates. These mountains ranges formed by the movement of the plates.

These mountains can rise thousands of meters above the rest of the sea bed. The Mid Atlantic ridge is the longest mountains range measuring about 15,000 km, even longer than the Andes. It runs along the center of the Atlantic Ocean form the arctic to the Antarctic. Iceland straddles this ridge and was formed by the volcanic outpourings. Ocean trenches are found all along the edges of the Pacific Ocean parts of the ocean floor. The deepest recorded trench is the Mariana Trench, which is 11,034 m deep.

The largest ocean is the Pacific Ocean, which has an area of about 166 million sq.km. This is followed by the Atlantic Ocean, which, measures about 82 million sq.km. The third largest is the Indian Ocean at about 74 million sq.km. The smallest is the Arctic Ocean which is about 12 million sq.km. The term, Antarctic Ocean, is generally used to explain the far reaches and Atlantic Ocean, which extend south of the Antarctic Circle.

Much of the ocean floor is covered with sand and mud brought by the rivers. In certain places there are hot springs which bring up sulphur and other minerals. The water is salty because of the minerals, the main mineral being salt. The mud of the ocean floors is soft and made up of the lime shells and skeletons of the tiny sea animals. With the pressure of the water and the passage of time, these sediments gradually form hard rocks.

To know more –

Glass: A Transparent Substance

Some Impressive Mountain Formations

Scientists Proved That Atom is Not the Smallest Particle of an Element

Galileo Galilei: A Very Talented Boy

Dynamite: A Kind of Explosive

How to Save Money for Your Children’s Education and Retirement

When Was the Parachute Invented?

How Was the Telephone Invented?

Pomegranates – Nutrition Facts and Health Benefits

Papaya – Nutrition Facts and Health Benefits

Orange – Nutrition Facts and Health Benefits

Mangos – Nutrition Facts and Health Benefits

Jack Fruit – Nutrition Facts and Health Benefits

Best Lenovo Laptops to Buy – Price List

Best LG Laptops to Buy – Price List

Best IBM Laptops to Buy – Price List

5
Liked it
8 Responses to “When and How Were the Oceans Formed”
  1. Stephanie Says...

    On May 13, 2009 at 3:47 pm

    Thanx soo much i loved all the information it really helped me with my project and i can show lots of my ideas with it sooo…. thanx thanx thnx so much i couldnt have done it with out this :)


  2. Kimberly Sarganti Says...

    On May 20, 2009 at 1:14 pm

    im doing this poweroint and this info really helped me


  3. w3ndy m0r@l3$ Says...

    On September 22, 2009 at 4:15 pm

    ………h3yyyyyy XP XP im doing project nd th3 info reallyyyyyy helped m3………….


  4. Kathy prinzzzzzzz Says...

    On February 26, 2010 at 7:20 pm

    wiiiiiii thanx very much for the infooo
    it helped me at the quizzzz
    100√óD
    love the guy who place this


  5. sang Says...

    On June 21, 2010 at 11:45 pm

    excellent, it really is excellent


  6. fulffy Says...

    On July 20, 2012 at 6:33 pm

    i really didnt get it they should know how oceans and lakes form.By now


  7. akshat suri Says...

    On August 19, 2012 at 1:36 am

    thanks i used the information for my geography project


  8. akshat suri Says...

    On August 19, 2012 at 1:37 am

    thanks i used the information for my geography project


Post Comment
comments powered by Disqus