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
Explain the Types of White Blood Cells White blood cells are actually a whole collection of different cells that work together to destroy bacteria and viruses. You may recall s

Explain the Gonadotropic Hormones (GTH): There are two gonadotropic hormones which regulate gonadal functions. They are follicle stimulating hormone (FSH) and luteinizing hormo

Objectives After completing this exercise you should be able to: 1. Locate the source and control points of gas/electricity/water supply in the lab you have visited, 2. D

The Moon, the Earth's  Companion What do you norrqally observe about the Moon? Itshinesbrightest, whenever present in the night sky. It seems to go through phases and it seems t

Explain the Functions of the Kidney The functions of the kidneys, as you already know, are to form urine and to pass urine for excretion, maintain water and electrolyte balance

Explain How tongue can sense different tastes? Our tongue can sense different tastes. Do you know which are the basic tastes and the areas where these are sensed? In humans, th

discuss homeostatis. I have choosen the bodies temperature and I need to discuss it and what effects it has on the body

Method of science: We have seen above that science is an enaeavour  to understand nature and to mould it to satisfy human needs. In earlier units we have seen that, in  this pr

For chemically reactive wastes : The chemical property of the waste could be used in its removal in a number of ways as given below: i) Some water-reactive waste could be dispo

a. How many ion pairs are produced in 1 cm 3 of air during an exposure of 100 mR? The density of air at STP is ρ = 1:293kg m -3 . What is the absorded dose to air? b. An thin w