specifically to meet the needs of AS students, it provides comprehensive, accessible and up-to-date coverage of topics for all exam boards. The content is carefully structured around the specifications. It combines informed discussion with the most up-to-date facts and figures and includes the following features: Definitions of key terms and concepts to help understanding and revision. Weblinks and associated activities. What you should know summaries at the end of each chapter Exam focus sections at the end of each chapter offering source-based exercises relating to the text as well as assignments for extension work, drawing on suggested reading and website listings.

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