Take the local train, Circumvesuviana, from the Sorrento Central train station to the Naples Central Railway Station. Sorrento is the last and first stop on its trip around the Gulf of Naples, so you don't have to worry about getting on a train in the wrong direction. Train fare costs about $5.50.
How elements are formed. Our world is made of elements and combinations of elements called compounds. An element is a pure substance made of atoms that are all of the same type. At present, 116 elements are known, and only about 90 of these occur naturally.
Over the past two centuries, we have gained a much better understanding of the atomic elements and how they have formed. One of the things we have learned is that weâand every other living thing on Earthâare made up mostly of four elements. These four atomic elements are oxygen, carbon, hydrogen, and nitrogen. Together they make up about 96% of our bodies, as you can see in the figure.