This ebook follows the guidelines of the National Curriculum Order for Science. There is plenty of material that all will find interesting and fun to tackle and other work that is more challenging. The work in Key Stage 3 is a logical development of the material already covered in Key Stage 1 and Key Stage 2. Some of the material in this book may have already been dealt with and any worksheets concerned will be useful for revision. The scope of the material taught in science today has widened considerably and the emphasis on relating the subject to ‘real’ situations in the ‘real’ world makes the subject less mysterious and of more obvious use.