This comprehensive text has been written to support both the GCSE Science and GCSE Additional Science in one complete volume. Written specifically for the revised WJEC specifications, the book concentrates on providing support in understanding how science works throughout. The focus is on putting science into real-life contexts and on allowing students to understand that science is more than what happens in a laboratory. The authors of this book include experienced examiners who aim to motivate and engage students, and have included lots of up-to-date references and ideas to stimulate teaching. With many examples set in a Welsh context, it is the perfect accompaniment for those students following the Welsh exam board's specifications. For the average-ability student, the book breaks down concepts into manageable sections. To support the lower-ability student, accessible language goes hand in hand with plenty of appropriate diagrams. Higher-ability students will also find areas to progress their skills and apply their knowledge in the activity and question boxes, which highlight higher-ability material. 'Did you know' boxes, worked examples, questions and tips feature throughout the text. This text is written in Welsh.