Unit 1 Expeditions for Science 1
Exploring Antarctica 2
A Land of Ice 4
Why Go？ 5
Ice and Glaciers 6
Icebergs 8
The Arctic 10
Is There Life？ 11
The Changing Earth 12
Expeditions in Review 12
Unit 2 Time and the Stars 15
Rotation of the Earth 16
From West to East 19
Day and Night 21
Noon and Midnight 22
Time and Rotation 22
The Clock in the Sky 24
Revolution of the Earth 26
Time in Review 26
Unit 3 Exploring the Sky 29
Up and Away 30
Lift 30
Drag 34
Thrust 36
The Controliable Parts 38
Helicopters 38
The Jet Airplane 39
Flight in Review 40
Unit 4 Sound and How It Travels 43
Sound Vibrations 44
The Speed of Sound 46
Flying Faster Than Sound 46
Controlling Sound Waves 47
Your Hearing 51
Silent Sounds 53
Unit 5 Electricity and Magnetism 57
What Can Magnets Do ？ 58
Electromagnets 62
Electromagnets and Sound 66
How Do Motors Work ？ 68
Unit 6 Understanding Heat 75
Temperature 75
Thermometers 77
Molecules in Motion 80
Expansion and Contraction 81
Traveling Heat 83
Conduction 86
Convection 88
Radiation 92
Removing Heat 95
Glossary 99