Buried deep beneath Earth's surface is a very valuable natural resource. Fossil fuels power our world. We dig them up so that we can use them to create electricity. But they do so much more than that. They are the fuel that runs our planes, trains, cars, and trucks. From the asphalt of our streets to the ink on our money, fossil fuels improve our lives. We even use them to make everyday items like plastics. Readers learn even more about earth science through the color photographs, fact boxes, a hands-on activity, and a Words to Know section.