The Science Foundations Extensions books form a three-volume addition to the original Science Foundations series. They provide all the extra material required for students to do well in higher-tier examinations, whilst retaining the accessible format of the foundation-tier texts. Enhanced features include: * layout and illustrations designed and chosen to make the texts accessible * comprehensive cross-referencing to the Foundations texts * frequent opportunities to check understanding of each concept * a glossary of key words, for easy reference Answers, additional questions, practical suggestions and module tests are also included. There is also a section containing advice on how to do well in higher-tier examinations.