Humans and animalsSkeletonsFunctions of the skeletonMuscles and bonesMovement of bonesDrugs as medicinesLiving things in their environmentAnimals in their habitatsIdentification keysHuman activity and the environmentStates of matterSolids, liquids and gasesHeating and cooling materialsMelting and freezingSteamSoundSound making and measuringSound travellingMaterials preventing sound transmissionPitch and loudnessMusical instrumentsElectricity and magnetismConstructing circuitsBroken circuitsElectrical currentMagnets attract and repelMetals and magnetsGlossary.