Coal introduces the reader to these valuable natural resources. Find out what cola is where it is found and how it is used. Discover why it will run out in the future and learn all about how to save coal. Our world series has been specially developed for use in the classroom and includes the following features: Two differentiated text levels using typefaces recommended by the national literacy strategy allow students of mixed reading abilities to enjoy the same book for whole-class teaching, group reading, or individual work. Designed with educational consultants to support the national curriculum and the national literacy strategy.