Briefly explain the indirect sources of information of the interior of the
earth other than those of seismic activity class 11 geography chapter name is interior of the earth
Answers
Answer:
Body waves are earthquake waves which are generated due to the release of energy at the focus and move in all directions travelling through the body of the earth. (ii) The direct sources of information about the interior of the earth are:
Mining: It is the process of extracting valuable minerals from the earth. Surface rock or the rocks we get from mining areas provide most easily available solid earth material.
Drilling: Scientists are working on major projects such as 'Deep Ocean Drilling Project" and "Integrated Ocean Drilling Project". This and many deep drilling projects have provided large volume of information through the analysis of materials collected at different depths.
Volcanic eruption: It forms another source of obtaining direct information. As and when the molten material (magma) is thrown onto the surface of the earth, during volcanic eruption it becomes available for laboratory analysis.
(iii) Earthquake wave develop shadow zone because P and S waves follow a curved path inside the earth due to increasing capacity. The shadow zone of S-wave is much larger than that of the P-waves. (iv) The indirect sources of information of the interior of the earth are:
Temperature, Pressure and Density: These increase with the increasing distance from the surface towards the interior in deeper depths. The rate of change of Temprature, pressure and density are known. Knowing the total thickness of the earth, scientists have estimated the values of temperature, pressure and the density of materials at different depths.
Meteors: These are not from the interior of the earth but the material and the structure observed in the meteors are similar to that of the earth. This make them another source of information about the interior of the earth.
Gravitation force: It is greater near the poles and less at the equator. The gravity values also differ according to the mass of material. The uneven distribution of mass of material within the earth influences this value.
Magnetic Field: Magnetic surveys also provide information about the distribution of magnetic materials in the crustal portion, and thus, provide information about the distribution of materials in this part
Explanation:
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Answer:
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Explanation:
The knowledge about interior of the earth is obtained through direct sources and indirect sources. Direct sources include rock materials from mining areas and molten magma from volcanic eruptions. ... Indirect sources include meteors that at times reach the earth, gravitation, magnetic field, and seismic activity.Hence, this becomes yet another source of information about the interior of the earth. The other indirect sources include gravitation, magnetic field, and seismic activity. The gravitation force (g) is not the same at different latitudes on the surface. It is greater near the poles and less at the equator.