Final answer:
Natural gas is less volatile than oil and consists primarily of methane and other smaller hydrocarbon molecules.
Step-by-step explanation:
Natural gas is less volatile than oil, and consists of primarily methane (CH4) and other smaller hydrocarbon molecules. Compared to crude oil, which is a viscous liquid composed of thousands of organic compounds, natural gas is a mostly combustible gas found underground. It is predominantly composed of methane, with different compositions depending on the well.