Natural gas is also a fossil fuel like oil. And it is also a non-renewable energy similar to oil energy because it can’t be replaced in human time-frame. It is formed when plants and animals, which store the solar energy in them, gets buried inside the earth and due to heat and pressure applied over a span of 1000 years.
Gas is normally called as natural gas because it contains hydrocarbons, which are naturally occurring chemicals. It is colorless and mainly consists of methane, which is the primary hydrocarbon.
Natural gas is a mixture of hydrocarbon gas. Its main constituent is methane of the alkane family. It also consists of various other higher order alkanes such as ethane, butane and others in varying proportions. It might also consist of small quantities of carbon dioxide, nitrogen and hydrogen sulphide. Natural gas is a flexible fuel. It emits very less carbon dioxide when compared to coal.