Interior of the Earth: Crust, Mantle and Core
In this article (geography section), we discuss the interior of the earth. Understanding the basic structure of earth is very important to learn higher concepts well. Also, the origin of many phenomena like earthquakes, volcanoes, tsunami etc are linked with the structure of earth’s interior.
What should you understand about the interior of the earth?
- ➢ It is not possible to know about the earth’s interior by direct observations because of the huge size and the changing nature of its interior composition.
- ➢ It is an almost impossible distance for the humans to reach till the centre of the earth (The earth’s radius is 6,370 km).
- ➢ Through mining and drilling operations we have been able to observe the earth’s interior directly only up to a depth of few kilometers.
- ➢ The rapid increase in temperature below the earth’s surface is mainly responsible for setting a limit to direct observations inside the earth.
- ➢ But still, through some direct and indirect sources, the scientists have a fair idea about how the earth’s interior look like.
Sources of Information about the interior of the earth
- 1. Rocks from mining area
- 2. Volcanic eruptions
- 1. By analyzing the rate of change of temperature and pressure from the surface towards the interior.
- 2. Meteors, as they belong to the same type of materials earth is made of.
- 3. Gravitation, which is greater near poles and less at the equator.
- 4. Gravity anomaly, which is the change in gravity value according to the mass of material, gives us information about the materials in the earth’s interior.
- 5. Magnetic sources.
- 6. Seismic Waves: the shadow zones of body waves (Primary and secondary waves) give us information about the state of materials in the interior.
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