Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment.
There will be 10 seasons, on IMDB.com they show 10 seasons with the first episode of season 10 starting in September.
John Schneider: (Laughs) No, there's my wife and my son and daughter. It is the most fun I've had since when I started Dukes. I think because of the way Tyler does the show. We shot 20 episodes in 18 days. It's insane, Dukes took 10 months, Smallville took 10 months, Dr. Quinn took 10 months, everyone takes 10 months.