Safeopedia explains Coal Washing. Coal is a type of sedimentary rock that is formed by buried vegetation that is transformed by pressure and heat over long periods of time. Coal will eventually turn into diamond formations with enough time, pressure and heat. Impurities include slate and other non-organic rocks etc..
The number of presidents born per state are: 1  One: Arkansas, California, Connecticut, Georgia, Hawaii, Illinois, Iowa, Kentucky, Missouri, Nebraska, New Hampshire, New Jersey, Pennsylvania, and South Carolina. 2  Two: North Carolina, Texas, and Vermont.  Four: Massachusetts, and New York.
William McKinley Presidential Library & Museum This large circular, domed mausoleum is the final resting place of William McKinley, the 25th president of the United States. McKinley was born in Niles, Ohio but he called Canton home throughout his adult life. He began his career in this city, met his beloved wife, and ran for the highest office of the nation here.