Physical features of the oceans, Science

Assignment Help:

Some Physical Features of the Oceans:

The oceans are so vast that they stagger one's imagination. They cover more than 70  per cent of the earth's surface. The depth of oceans varies, from shallow near the coasts to deep in the middle. There are  trenches, valleys,  and what may becalled hills under theocean waters. Tlie deepest part happens to be in middle

Pacific Ocean and its depth is greater  than the height of Mount Everest-the highest peak in the world.  Ocean waters are  never still. Wind exerts frictional force on the surface of water and generates waves that keep the surface water in motion. Tides are another type of movement of  the oceanic water, noticeable  in coastal regions. Water level of sea rises and falls twice a day. The gravitational pull of the sun and the moon, is the principal cause of the formation of tides.

Coastal waters rise to a high point called the high tide, when the sun and the moon are  on the same side of  the earth, and the tide is low when the sun and the moon happen to be on the opposite sides. Ocean currents are yet another form of water movement. Currents are generated in several ways :  by  changes in the density of sea water, due  to  temperature differences, by  the effect of earth's  rotation and also prevailing winds.

These currents transport sea water over long distances, more or less like rivers on the surface of the earth. Ocean water is salty. It has about 35 parts of salt (by weight) per  1000  parts of water. Ordinary salt or sodium chloride is the major salt component of the oceanic water.

Salts of magnesium, calcium and potassium are also present. This substantial amount of salt in sea water, is the result of accumulation of small bits of salt that are carried by  rivers from the lands they drain. Oceanic waters have a minimum temperature well below zero Celsius, near the poles, and a maximum of about 28 Celsius in the tropics. Another aspect of marine environment is pressure. The atmosphere exerts a pressure of about 1  kilogram per square cm (= 1 Atmosphere Pressure) at the surface of the sea or land. This pressure increases due to the weight of water by  1 Atmosphere,  for every  10 metres of the depth of water. Thus, if you are at a depth of 3000 metres in the ocean, the pressure there would be 300 times that at the earth's surface. It would be quite impossible  for human beings to survive at this depth without very special equipment.  


Related Discussions:- Physical features of the oceans

Explain error catastrophe theory of ageing, Explain Error catastrophe theor...

Explain Error catastrophe theory of Ageing As the cells age, there is a random increase in error in protein synthesis due to insertion of wrong amino acids. They become non- fu

Need for code of behaviour for laboratory staff, Need for Code of Behaviour...

Need for Code of Behaviour : A laboratory is a potentially dangerous working environment. Cuts from broken glass, chemical or thermal burns and poisoning are three examples of lab

Describe nabh accreditation, Question 1 Discuss the history of quality in ...

Question 1 Discuss the history of quality in healthcare services Question 2 Explain the dimensions of quality in healthcare Question 3 Describe NABH Accreditation

History, describe the factors which decide broad area of scientific activit...

describe the factors which decide broad area of scientific activity

Asthma, what are the systems that are affected by asthma

what are the systems that are affected by asthma

Levels of orgnization, ehat is protoplasm and other levels of organization

ehat is protoplasm and other levels of organization

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd