Aristotle believed that everything in the world consisted of and was made from fire, air, earth, and water. He considered these the elements of the world. There were also the forces of hotness, dryness, coldness, and wetness in his theory. This began the thought that everything was made of something smaller, eventually developing into the idea of the atom and element. Aristotle did not agree with Democritus, and their idea conflicted. His idea was adopted somewhere around 360 B.C.E.