The main gas in natural gas is methane (CH4). Methane is a colorless, odorless gas that is primarily found in underground deposits formed from the decomposed organic matter over millions of years. Natural gas is primarily composed of methane, typically making up 70-90% of its volume, along with smaller amounts of other hydrocarbons, carbon dioxide, nitrogen, and hydrogen sulfide. Methane is a significant source of energy, commonly used for heating, cooking, and electricity generation. It is also considered a cleaner-burning alternative to coal and oil because it produces fewer emissions of carbon dioxide and pollutants when combusted.