Natural gas may heat our homes and help us cook, but rarely do people consider where it comes from, or even what it's made of. Incredibly, this gaseous mix of mostly methane and ethane didn't become a major source of the world's energy until the 1960s. It was thought to be an inconsequential by-product of oil production. There's much to learn about natural gas in this beneficial book, which focuses on how the gas is formed as well as examines how it's mined and used today. The text highlights the most relevant and engrossing information, while graphic organizers help readers identify the most important concepts.