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It took us years of scientific investigation and analysis of data to form an understanding of the interiors of the Earth . The main reason for this is that even the deepest mines we have dug do not go beyond a few kilometers under the surface while the radius or the distance to the centre of the earth is over 6000 kilometers .
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It is difficult to study the formation of structure of the earth because the earth is continously moving.
And because the earth is always active

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