Many scientists came up with their own theories till the time when Newton proposed that Earth's interior is made up of much denser material. The density of the inner Earth is twice as that of the rocks on the surface of the Earth. This density reveals the cause for the formation of different layers inside the Earth.
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http://www.wonderwhizkids.com/index.php/planet-earth
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http://www.wonderwhizkids.com/index.php/planet-earth
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