Understanding Science is a New Zealand write-on textbook for students preparing for the NCEA Level One Science external assessments. All three external standards in Science are covered in a proven full colour, easy-to-understand format which can be used by students in the classroom and at home. This book covers the three external standards: 1.1 Aspects of Mechanics; 1.5 Aspects of Acids and Bases; 1.9 Understanding of Biological Ideas Relating to Genetic Variation. The text is written in clear, comprehensible English and supported by full colour photographs and diagrams to enhance interest in Science. Carefully constructed questions at the end of each unit reflect the emphasis of NCEA assessments and prepare students for the external examination.