Unit 1 Classification of living things Unit 2 Microorganisms Unit 3 Environmental pollution Unit 4 Physical and chemical changes of matter Unit 5 Light and sound Unit 6 Electricity and magnetism Unit 7 Structure of Earth Unit 8 Space and Satellites Unit 9 Matter and The Water Cycle Unit 10 Forces in Action Unit 11 Electricity Unit 12 Magnets and Electromagnets Unit 13 Light Unit 14 Air Unit 15 The Solar System