Physical features of the oceans, Science

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.  

Posted Date: 9/28/2012 5:18:48 AM | Location : United States







Related Discussions:- Physical features of the oceans, Assignment Help, Ask Question on Physical features of the oceans, Get Answer, Expert's Help, Physical features of the oceans Discussions

Write discussion on Physical features of the oceans
Your posts are moderated
Related Questions
Q. When are conditions right for harvesting a crop for local and distance markets? The conditions right for harvesting a crop for local markets: harvest in the early morning t

Maintain the Calcium Levels of Body– Function of Kidney Maintain the body’s calcium levels. Along with parathormone and calcitriol, kidney helps the body to absorb calcium.

The industry dealing with hazardous materials should draw emergency disaster plan. Safety committees consisting of workers and management are required to review from time to tim


A model illustrating how an eclipse appears The sun is shown by an opal electric bulb shining by a circular hole 5 cm in diameter in a piece of blackened cardboard. The corona

Plaster of Paris Secure some plaster of Paris and mix a small amount with water. It must be worked quickly or it will harden whereas being mixed. Place the mixture in moulds an

Which would give the best indication of how a rock was formed: mineralogy and texture

STERILIZATION OF GLASSWARE Activity is related activities. Whenever you require the glassware for doing an experiment you can follow the procedure given in Activity independent

Define Systemic Physiology - physiology of growth and development There is a change in the blood count and rate of haemoglobin (Hb) production during the early days. Cardiovasc

_____ are often responsible for clogging pores and causing pimpiles