"It takes millions of years to make coal! Today, one-third of the worlds electricity is created from burning coal. It is an important resource to understand as an energy source, even though its use can be controversial. This volume covers the processes that transform organic remains into coal, coal mines, and the carbon cycle. Readers learn about the pollution caused by burning of coal as well as about coal alternatives available today. The age-appropriate text presents a well-balanced look at this relevant subject, complemented by graphic organizers, photographs, sidebars, and fact boxes"--.