Note: Chlorhexidine may cause staining of the tooth, tooth filling, and dentures or other mouth appliances. Tetracycline use during tooth development phases (from the last half of pregnancy through eight years of age) may cause permanent discoloration (yellow, gray, brown) of teeth.
What is Coal made of? Coal is made from trees or plants that decayed on the ground for millions of years. The remains of various plants and trees then mixed with the other components of the ground and eventually going through several natural processes making them more like solid rocks.
Coal was the backbone to the industrial revolution. Without it the industrial revolution would have never been the same. Coal was a unlimited resource that great Britain obtained and used to fuel the steam engine, trains, boats and tractors. Through coal the iron industry made. Coke was taken from coal and used to burn away impurities in crude iron. This made they iron of much high quality. This iron was used to build new machines and especially trains.