The city's fire department operates out of three (3) different fire stations. Each station is manned by at least two (2) firefighter-EMT's; and there are two (2) firefighter-paramedics assigned to each shift.
One of these materials - silicon - is making it possible for you to read these words right now! That's because silicon is the essential material in an electronic computer chip. Semiconductor means a material can conduct electricity with a bit of help in the form of added impurities..
Graphite, while also composed of carbon, has an entirely different crystal structure, and different uses. Graphite is used as an electrical contactor (a brush) in electrical motors. It makes a great dry lubricant for things like locks, and when mixed with clay, forms the lead for ordinary pencils.