The burning of coal is a process of chemical changes in which oxygen in the air unites with carbon from the coal, giving off light and heat. 1.which가 in의 목적격관계대명사 같은데 선행사가 a process of chemical change인가요? Coal and oil were formed when plants became buried in marshes or swamps and then decayed. 여기서 decayed앞에 became이 생략된 형태인가요?? COAL Coal vs. Nuclear Power ... are coal-fired power plants and nuclear power plants. Both nuclear power plants and coal-fired power... The major differences between coal-fired and nuclear... Coal-fired plants produce over two thirds of all... THey are basical Resorting to coal should avoid for the sake of enviroment. 잘못된 곳은요? COAL Coal and petroleum, resulted when plants became buried in swamps and decayed.1. 위 문장해석부탁드립니다..2. 위 문장에서 동사는 무엇이며, petroleum과 resulted 사이에 ,는 왜 있는 것인가요...?상세한 답변부탁드립니다..