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The Earth – Inside and Out
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It was Isaac Newton who, in 1700, calculated the average density of the Earth, using his Theory of Gravity. He was surprised to find that it was more than double the density of rocks on the surface of our planet. It followed naturally that the inside had to be much denser than the outside and, possibly, that the Earth became progressively denser as one got nearer the centre. Newton hypothesised that the centre was made of very heavy metals which sank to the centre of the Earth through the force of gravity
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