Naughty world.The density of the Earth is 5515 kg/average M3. It is a planet in the solar system, the most crowded, but if you only measure the average density of the Earth surface and measure just over 3000 kg/m3 only, which caused the conclusion that there must be other objects that are in the thick of world naenkwa naughty indeed. During the emergence of the world. About 4.5 billion years ago. Melting can cause matter flow with density more into the kaenklang of the world, whereas substances with a density less than cover the crust is. Which makes the naughty world of elements as iron, including 80% nickel, and weighs more than the other, but the light while the matter is dense as lead and uranium. There is too little to be merged with elements that are lighter and make them fixed on the matter crust. Organising the world split into two layers:
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