This book provides coverage of the Level 2 NCEA Science achievement standards. It is designed so that students can understand and recall essential ideas, principles and processes. Features: self-study process, designed to be used independently of teacher input, for classwork, homework, revision or relief work; compact units containing content and assessment activities; content cestions cover essential facts, principles and processes; assessment sections test students' understanding of subject matter; topics are colour-coded and there are many colour diagrams and photographs; all terminology is clearly defined in an extensive glossary.