Table of Contents
Introduction
How science works 6
Working scientifically 8
Fields of science 10
How engineering works 12
Life
What is life? 14
Classification 16
Nutrition 18
Human digestive system 20
Teeth 22
Blood 24
The heart 26
Sensing and responding 28
The human eye 30
The human ear 31
How animals move 32
Muscles 34
Skeleton 36
Staying healthy 38
Animal reproduction 40
Life cycle of mammals 42
Life cycle of birds 43
How eggs work 44
Life cycle of amphibians 46
Life cycle of insects 47
Growth and development 48
Evolution 50
Plants 52
Types of plant 54
Flowers 56
Seed dispersal 58
How seeds grow 60
Asexual reproduction in plants 62
Single-celled organisms 64
Food chains and recycling 66
Humans and the environment 68
Matter
States of matter 70
Changing state 72
Properties of matter 74
Expanding gases 76
Mixtures 78
Solutions 80
Separating mixtures 1 82
Separating mixtures 2 84
Metals 86
Iron 88
Aluminium 89
Silver 90
Gold 91
Carbon 92
Materials science 94
Polymers 96
Energy
What is energy? 98
Renewable energy 100
Sound 102
Light 104
Reflection 106
Forming images 108
Telescopes and microscopes 109
Colours 110
Electromagnetic spectrum 112
Static electricity 113
Current electricity 114
Electric circuits 116
Forces
What are forces? 118
Stretching and deforming 120
Magnetism 122
Friction 124
Drag 126
Simple machines 128
More simple machines 130
Gravity 132
Flight 134
Floating and sinking 136
Earth and space
The Universe 138
The solar system 140
The Sun 142
The planets 144
Gravity and orbits 146
Earth and the Moon 148
How fossils form 150
Rocks and minerals 152
The water cycle 154
Rivers 156
Glaciers 158
Weather 160
Climate zones 161
Answers 162
