natural gas - Is a fossil energy source that formed deep beneath the earth's surface. It contains many different compounds such as carbon dioxide and water vapor., crude oil - Is a naturally occurring petroleum product composed of hydrocarbon deposits and other organic materials., coal - Is a combustible black or brownish-black sedimentary rock., hydrocarboncompounds - Is an organic compound consisting entirely of hydrogen and carbon., pipeline - A very long large tube, often underground, through which liquid or gas can flow for long distances., methane - Is a one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms., ethane - Is an organic chemical compound with chemical formula C2H6., fossil fuels - Is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules., water vapour - Is the primary form of atmospheric moisture., cubic feet - Is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom.,

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