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29 - We can say something about the material of rocks...

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We can say something about the material of rocks, however. All things in the part of the universe between the moon and the center of the earth are composed of one or more of the four elements, earth, water, air and fire. So the material of the rock would be almost entirely earth. A ball of mud would be a mixture of earth and water, etc. The elements are constantly being mixed up with and separated out from one another. Aristotle inquired into the principle of the movement of bodies. Other than animals which move themselves, bodies in the neighborhood of the earth are moved by other bodies, and these in turn by still others. Aristotle believed that if there were no constant source of motion, the elements would settle out into their natural places: earth in a sphere immediately surrounding the center of the earth (which is also the center of the universe), water in a shell around sphere of earth, air in a shell encompassing that of water, and fire in the outermost shell. It is the tendency to settle into their natural place which explains
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