Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and through controlled airspace, and can provide advisory services to aircraft in non-controlled airspace.
While the genre of some works of literature can be debated, Macbeth written by William Shakespeare seems to fit into a perfect mold. Aristotleâs definition of a tragedy, combining seven elements that he believes make the genre of a work a tragedy, is that mold. Displaying all seven aspects, Macbeth fits the definition precisely. Key elements in the play substantiate the fact that Macbeth is a serious story, the first elements of Aristotleâs definition.
With a short venture into the world of metaphysics, you are about to find out the answer! In ancient Greece, all material things were said to be composed of a mixture of the four elements of earth, fire, water and air. There was also said to be a more subtle, fifth element. This was called the quintessence (literally, fifth element), implying its very delicate or refined state of existence. For many centuries, philosophers considered that all matter consisted of combinations of the basic elements in the Greek tradition.