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According to medieval scientists, matter was composed of four elements—earth, air, fire, and water—whose combinations and permutations made up the world of visible objects. The cosmos was a series of concentric spheres in motion, the farther ones carrying the stars around in their daily courses. At the centre was the globe of Earth, heavy and static. Motion was either perfectly circular, as in the heavens, or irregular and naturally downward, as on Earth. The Earth had three landmasses—Europe, Asia, and Africa—and was unknown and uninhabitable in its southern zones. Human beings, the object of all creation, were composed of four ...(100 of 156573 words)