Chapter 1 The Earth

For example, if you take pure steel as the most solid of all metal substances and you break such a steel bar into two pieces, you will easily notice the crystalline texture at the white crack, which will indeed appear to be strikingly uniform to the unaided eye. But if this fractured plane were to be studied under a microscope, it would take on an appearance as though somebody were looking down from a high mountain to all kinds of big and small ridges. But if such a difference can be noticed in the crystalline structure of one of the most solid of metal substances, how much bigger will such a difference even be in a far less dense body whose crystalline structure of big and small, dense and less dense, is often easily perceivable even to the unaided eye. According to this, the principle established above can be verified even more that the center of gravity and the center of physical measurements can never coincide in a single point. – The Earth, Chapter 1, Paragraph 4

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