Introduction; PART ONE SKILLS; Unit 1 Asking questions; Unit 2 Observing; Unit 3 Looking for similarities and differences; Unit 4 Classifying; Unit 5 Recording; Unit 6 Interpreting; Unit 7 Analysing; Unit 8 Concluding; Unit 9 Suggesting explanations; Unit 10 Predicting; Unit 11 Making tests fair; Unit 12 Applying ideas; Unit 13 Improvising; Unit 14 Being curious; Unit 15 Being practical; PART TWO TOPICS; Unit 16 Investigating earth; Unit 17 Investigating air; Unit 18 Investigating water and other liquids; Unit 19 Investigating weather; Unit 20 Investigating natural habitats; Unit 21 Investigating the man-made environment; Unit 22 Investigating reproduction; Unit 23 Investigating food; Unit 24 Investigating health; Unit 25 Investigating work; Unit 26 Investigating tools; Unit 27 Investigating bikes; Unit 28 Investigating conservation; PART THREE TESTS; Test One; Test Two; PART FOUR TEACHER'S SECTION; Grid Part 1 Skills to Topics; Grid Part 2 Topics to Skills; Test Grid; Answers to questions in UNITS; ACKNOWLEDGEMENTS;