The Greek philosophers of the Classical era, led by Empedocles, who was followed by Aristotle, believed that everything in the universe was made up of four elements: earth, air, water, and fire.
Everything in the world, from corn to cotton to clouds,was composed of these four elements; the differences between all the things we see or touch was only the relative abundance and mixing manner of the four constituent components. For instance, clouds, according to Aristotle, were a light composition of air and water. Cotton, on the other hand, was a mixture of rock, air, and water, and differed from ...
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