Chapter 1 The Earth

If, for example, you observe any stone, or any other regular or irregular lump, it will soon become apparent that it's center of gravity is not equally evident on all parts of it; In particular, you can see this most easily with a somewhat misshapen wooden peg by placing it on water, where it will always sink it's center of gravity deepest into the water. This would be the second point, which everyone can easily find with every object. – The Earth, Chapter 1, Paragraph 2

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