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You should know the facts of Earth's Interior. What is the radius of The Earth?

Facts of Interior of the Earth        


     The earth's radius is 6370 km. No one can reach the centre of the earth and make observation or collect samples of the materials. Under such conditions it is wonder to know how scientist tell us about the earth's interior and the type of materials that exist at such depths. Basically the sources of information about the interior of the earth are two types. These are- 1. Direct Sources, 2. Indirect Sources. The most easily available solid Earth material is surface Rock On The Rocks we get from mining areas. Gold mines in South Africa sdps 3-4 km. Going beyond this depth is not possible as it is very hot at such depths. Besides mining, scientists have taken up a number of projects to explore the conditions in the crystal portions. Scientist world over are working on two major projects such as deep ocean drilling project and integrated Ocean drilling project. The deepest drill at Kola in Arctic Ocean has so far reached at depth of 12 kilometre. This and many deep drilling projects have provided large volume of information through the analysis of materials collected at different depths. Volcanic eruptions forms and other sources of obtaining direct information. As and when the molten material aur Magma is thrown onto the surface of the earth, during volcanic eruption it becomes available for laboratory analysis. However it is difficult to ascertain the depth of the source of such magma.
              Indirect services include gravitation magnetic field and systemic activity. The gravitational force is no the same at different latitudes on the surface of the earth. It is Greater near the poles and less at the equator. This is because of the distance from the centre at the equator be greater than at the  poles.  The gravity also different according to mass of material. The reading of the gravity at different places is also affected by many other factors. These readings differ from expected values. Such a difference is called gravity anomaly. The gravity and provide information about the distribution of the mass of material at the crust of the earth. Magnetic surveys also provide information about the magnetic activities in the crustal portions of the earth, and thus, it provides information about the distribution of materials in this part.  The siesmic activity is one of the most important about the interior structure of the earth. It is caused due to the released of energy which generates web that travel in all directions. The release of energy occurs along the fault. A fault is a short break in the castle rocks. The point where the energy is released is called the focus of an earthquake. It is also known as hypo centre. The energy waves travelling in different directions reach the surface. The point on the surface nearest to the focus is called epicenter. It is the first one to experience the Waves. It is a. Directly above the focus.

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